FLUENT - Science topic

For 2 way FSI of Ball bearing, is it possible to keep Inlet/Outlet Boundaries as the Rotational Periodic Faces? For my case, it is a rolling bearing..I have modeled 40° out of 360°......And are 'Periodic ' different from 'Interface' Boundary Conditions? Thank you!

What problem are you having in ANSYS with the VOF (Volume of Fluid) model? You can clarify details such as the type of simulation, dimensions, or error messages you are seeing, and I will help you as much as I can.

Hello Vinayak Gautam ,

You should be able to modify the value of the Cs constant using a... DEFINE_PROFILE UDF. Nevertheless, if it works, you will have to check that it will still give physical values...

To apply a magnetic field on a silicon melt using ANSYS Maxwell and MHD:

1. Set Up Geometry & Materials: Model the silicon melt and assign its temperature-dependent properties (electrical conductivity, viscosity).

2. Configure Magnetic Field in ANSYS Maxwell:

- Create the field source (coils/magnets) and assign excitation parameters (DC/AC current).

- Define boundary conditions and solve for the magnetic field in the melt region.

3. Export Magnetic Field: Export the magnetic field results for use in the MHD simulation.

4. Set Up MHD in ANSYS Fluent/CFX:

- Enable the MHD model, define fluid properties, and import the magnetic field from ANSYS Maxwell.

- Couple the magnetic field with the fluid flow using the Lorentz force.

5. Run Simulation: Solve the coupled problem and analyze the effect of the magnetic field on the silicon melt flow and temperature distribution.

thank you for help.

Hello Mohammed Mansour Meky ,

The negative cell volume in ANSYS Fluent is related to dynamic mesh whether the flow is single phase or multiphase. You have to double-check the dynamic mesh model and settings and try to reduce the time step size. If there is a boundary layer adjacent to the moving wall (object) you have to check the option that excludes the boundary layer from remeshing.

Kind regards,

Ashkan

Hi, I wonder why you do not define the coarsing criterion in Fig. 4?

Generating regular waves in ANSYS Fluent involves setting up a computational fluid dynamics (CFD) simulation.

1. Create a new 2D or 3D model.

2. Define the geometry (e.g., wave channel, ocean surface).

3. Set up the mesh (structured or unstructured).

It simply means that temperatures are dropping ion those zones.

1. You can try giving a higher/ realistic temperature initial conditions.

2. Try giving more relaxation in energy equation

3. Try starting with adiabatic walls, when the flow stabilises, use this solution as an initial condition.

4. Use k-epsilon model initially till you get somewhat stabilised solution, and then only change the turbulence model.

Use any one of the above or a combination, whichever works for you.

Best of luck!

Dear Xin Xin Li,

This work was my doctoral thesis. I solved the problem. Thanks.

Hi Sir, Greetings

Please let me know, how to solve this issue in Ansys fluent.

Looking forward for your reply.

For practical applications, both temperatures may be taken as same.

Secondly, yes the shadow should not coincide with the extremity wall, or we can say that it should remain out of the boundary layer (of lower wall).

Hi Ben Wu

Easier or better? ANSYS Fluent is by far better than Flow3D for general use. However, it is more complicated and requires more time to learn.

The root of the problem is that no one seems to bother questioning the foundation of our current physics: Maxwell's equations. Einstein complained about that, too:

"All my attempts to adapt the theoretical foundation of physics to this new type of knowledge (Quantum Theory) failed completely. It was as if the ground had been pulled out from under one, with no firm foundation to be seen anywhere, upon which one could have built." (P. A Schlipp, Albert Einstein: Philosopher – Scientist, On Quantum Theory, 1949)

"You believe in the God who plays dice, and I in complete law and order in a world which objectively exists, and which I, in a wildly speculative way, am trying to capture. I hope that someone will discover a more realistic way, or rather a more tangible basis than it has been my lot to find. Even the great initial success of the Quantum Theory does not make me believe in the fundamental dice-game, although I am well aware that our younger colleagues interpret this as a consequence of senility. No doubt the day will come when we will see whose instinctive attitude was the correct one." (Albert Einstein to Max Born, Sept 1944, 'The Born-Einstein Letters')

So, in the 162 years since Maxwell published his work, no one has noted that his equations are actually inconsistent and not in alignment with the fundamental theorem of vector calculus.

After the discovery of the quantum circulation constant k, with a value equal to c*c but a unit of measurement in [m^2/s] I have been able to formulate a second order fluid dynamics model for the aether, wherein fluid dynamics and electrodynamics are seemlessly integrated and the Coulomb now has a unit of measurement in [kg/s].

This means a return to real fields and practical math. See the discussion here:

As for the comparison of the new model to Maxwell, ChatGPT summarized this as follows:

"In summary, while Maxwell’s equations provide a mathematically valid formulation, the new model offers a more physically consistent framework by rigorously separating linear and angular components, avoiding the blending of different types of behavior and ensuring adherence to fundamental principles of vector calculus."

Hello Gokul .s ,

This means that some interfaces are being generated in your model because you have partitioned the compute domain. If you do not want to use interfaces, you should use Share Topology in SpaceClaim or the Form New Part option if you are working with Design Modeler. The other solution is to connect interfaces in the Make Interfaces section in Fluent, which I do not recommend since you are a beginner.

HI all,

this udf can provide the heat transfer coefficient according to this ref:

F. Kuwahara, M. Shirota, A. Nakayama, A numerical study of interfacial convective heat transfer coefficient in the energy equation model for convection in porous media, Int. J. Heat Mass Tran. 44 (2001) 1153–1159.

#include "udf.h"

#include "sg.h"

#include "sg_mphase.h"

#include "flow.h"

#include "mem.h"

#include "metric.h"

#define PI 3.14159265

#define kf 0.134 // fluid thermal conductivity [w/m.K]

#define eps 0.86 // porosity

#define prandtle 53.6 // Prandtle number

#define df 0.00071 // ligament or fiber diameter in poros media [m]

#define Re_co 142.0 // Re contstant that is muliplyed by the velocity to calculate Re [s/m]

DEFINE_PROFILE(h_sf,t,i)

{

cell_t c;

face_t f;

real U_ave,h_sf,sum1,count1;

count1=0.0;

sum1=0.0;

begin_c_loop(c,t)

{

U_ave = pow((pow(C_U(c,t),2.)+pow(C_V(c,t),2.)+pow(C_W(c,t),2.)),0.5);

count1=count1+1;

if (U_ave > 0.0)

h_sf= kf/df*((1+4*(1-eps)/eps)+0.5*pow(1-eps ,0.5)*pow(Re_co*U_ave ,0.6)*pow(prandtle,1/3));

else

h_sf= 0.0;

F_PROFILE(c,t,i)= h_sf;

sum1=sum1+h_sf;

}

end_c_loop(c,t)

sum1=sum1/count1;

printf("average convection coefficient h_sf = %f [W/m2.K]. \n",sum1);

}

Μr Nicolis,

I agree. Given Einstein's inevitable relativity of time, spacetime is the "thing" to ascribe properties and not time - in its 4D manifold, Lorentz signature and - most familiar- metric defined geometry.

Thus any in depth inquiry about properties of time ends up physically irrelevant, also (state of the art ) physics-wise off

Yes, it is possible to simulate boiling using the evaporation-condensation model without explicitly including air, but achieving successful and realistic boiling requires careful attention to initialization and boundary conditions. In the absence of non-condensable gases like air, nucleation sites for bubble formation are significantly reduced, making spontaneous vapor bubble formation during the boiling process challenging. This might explain why boiling was not observed in your simulations. To address this, you can introduce small regions or patches of vapor within the liquid domain at the start of the simulation, effectively initializing small volumes with the vapor phase to act as nucleation sites. This approach helps to promote the formation and growth of vapor bubbles, facilitating a more accurate representation of the boiling process.

Fluent is a computer model--an approximation. Neither Fluent or any other computer model is the "last word" on anything, regardless of how much it costs or how many people have used it to do whatever. Experiments (properly conducted and analyzed) are the last word. The more complex the problem (geometry, fluids, phases, etc.), the more you must look to experimental data for direction and confirmation. Far too many on RG simply run a commercial code and think that's enough to get a PhD.

Hello,

We have also used computer clusters to calculate some CFD cases. Usually we use two methods to log in to the cluster remotely from a personal computer, upload and download .cas(.h5) and .dat(.h5) files, or view the results of the calculations directly on the cluster's linux system.

1. Login to the cluster via Xshell 7.0 software and upload or download files using Xftp 7.0 software. Generally upload the .cas and .dat files that need to be calculated, as well as the .pbs file and .jou file that set the number of iterations, the save command, the number of model dimensions and the number of cores used.This method can only be used to view the data (e.g. results such as Fluent's isosurfaces, etc.) by opening them on a personal computer after downloading the results from the cluster at the end of the computation.

2. You can also log in to the cluster through the windows remote desktop connection on your PC (type "remote desktop connection" in the search box on the taskbar in the bottom left corner of your PC). Enter the IP address of the cluster, enter the login screen, and then enter your username and password to access the visualisation of the cluster linux system. Right-click on the desktop of the linux system to open terminal. Go to FLUENT's bin directory via the linux cd command. Then type . /fluent to start running the FLUENT software, later you will be able to use the FLUENT software visually as in windows, to perform calculations and view contour plots. This eliminates the need to write .pbs and .jou files to set up iteration and save commands. However, uploading and downloading of computational cases between PCs and the cluster is still done through the Xftp 7.0 software. In addition, the graphics card of the cluster is usually weak and thus the image processing power is poor, but displaying some xy-plot graphs is no problem at all.

The above are the two methods we use. Due to differences in clusters and Linux versions (we use CentOs 7.9), not sure if this will help you.

Best regards

Guoxiang Tang

Sure, Benelhaoues Mohamed

Rajesh Kumar Sahoo I know the mass source term. I want to know where to add the UDF for the mass source term. Since it is a two phase flow, I don't see an option to add the mass source term after compiling the UDF. I see the option for adding the energy and momentum source terms but not the mass source term. When I switch to single phase, then only I see an option to add a mass source term.

thank you very much now I use the ansys 2021 version and I have the solution to the problem I had

Ahmed G. Rahma Can you share your .stl file?

thank you for your interaction.

i did find the issue which is the need of the initialisation.

CFD ANALYSIS OF HEAT EXCHANGER

MODELS DESIGN USING ANSYS FLUENT

Ram Kishan

M. Tech., Student, Department of Mechanical Engineering,

Sachdeva Institute of Technology, Farah, Mathura, India

Devendra Singh

Assistant Professor, Department of Mechanical Engineering,

Sachdeva Institute of Technology, Farah, Mathura, India

Ajay Kumar Sharma*

Assistant Professor, Department of Mechanical Engineering,

Institute of Engineering and Technology Lucknow, India

*Corresponding Author

ABSTRACT

The aim of the study is design tube and box heat exchanger

ABSTRACT

The aim of the study is design tube and box heat exchanger with various pattern of

tubes and examine the flow and temperature field at inlet and outlet point of tube and

container using ANSYS programming tool. Three types of heat exchangers are

planned in this examination with various structures of cylinders contains of 175 mm

breadth and 1000 mm length shell measurement 175 mm. To expand the rate of heat

exchange of heat exchanger advancement is done which tries to distinguish the best

parameter combination of heat exchangers. The prefix parameter (tube width) is

utilized as an info variable and the yield parameter is the most extreme temperature

distinction of container and tube heat exchanger. Three types models are design on

the basis tubes varieties of heat exchanger and CFX examination is completed in

ANSYS 14.0.

you are welcome

I myself was perplexed in this and got to know that first computing the recevrs data will work, then i can compute FFT.

But, when i click calculate , then it says the no of time steps in wiritng file is less then minimum 9450. I do not know how it computed or what? I specified this much number of time steps in writing Acoustic data but again this error appeared.

Darlington Amadi

EMMS drag model is as follows:

The EMMS drag model is based on the work of Chen et al. (2009) and can be expressed as:

$$F_D = \frac{1}{8} \pi d_p^2 \rho_c C_D |u_c - u_p| (u_c - u_p)$$

Where:

- $F_D$ is the drag force per unit volume of the dispersed phase

- $d_p$ is the particle diameter

- $\rho_c$ is the density of the continuous phase

- $C_D$ is the drag coefficient

- $u_c$ is the velocity of the continuous phase

- $u_p$ is the velocity of the dispersed phase

The drag coefficient, $C_D$, is calculated using the following expression:

$$C_D = \frac{24}{\alpha_c^{0.65}Re_p} (1 + 0.15 \alpha_c^{-0.687} Re_p^{0.687})$$

Where:

- $\alpha_c$ is the volume fraction of the continuous phase

- $Re_p$ is the particle Reynolds number, defined as:

$$Re_p = \frac{\rho_c d_p |u_c - u_p|}{\mu_c}$$

- $\mu_c$ is the dynamic viscosity of the continuous phase

The C++ code implementation of the EMMS drag model in ANSYS Fluent 2023 would be similar to the following:

```cpp

// Calculate the particle Reynolds number

double ReP = rho_c * dp * fabs(u_c - u_p) / mu_c;

// Calculate the drag coefficient

double alpha_c = 1.0 - alpha_p; // Volume fraction of continuous phase

double CD = 24.0 / (pow(alpha_c, 0.65) * ReP) * (1.0 + 0.15 * pow(alpha_c, -0.687) * pow(ReP, 0.687));

// Calculate the drag force

double FD = 0.125 * M_PI * dp * dp * rho_c * CD * fabs(u_c - u_p) * (u_c - u_p);

```

Good luck. partial credit AI

Hi,

Did you manage to find a solution for your problem ? I kind have the same issue and I am not able to solve it.

Thanks

Dear Israa Ali

Exergy have analytical equations and you may calculate their parameters based on your problem. you should use EES - implicit solver and Thermophysical library- for this purpose.

Good luck,

I believe it must be a non-premixed combsution in order to specify the fuel in each entry.

I have no idea what you're doing so I can't help you more than that.

Fluid Flow in Helically Coiled Pipes

📷

MDPI

https://www.mdpi.com › ...

by LDG Sigalotti · 2023 · Cited by 3 — The most notable feature of flow in helical pipes is the secondary flow (i.e., the cross-sectional circulatory motion) caused by centrifugal forces due to the ...

COMPUTATIONAL FLUID ANALYSIS OF TRIPLE ...

📷

SSRN

https://papers.ssrn.com › sol3 › Delivery.cfm › S...

PDF

... of 1000 mm length of all three tubes. The theoretical and computational fluid dynamics analysis of triple copper tube heat exchanger results showed better ...

TAWSS calculation: First-time statistics should be tick marked and from calculation activities select mean WSS, mean x WSS, mean y WSS and mean x WSS z WSS should be selected before running the calculation. You will find the variable Wall Shear Trnavg (TAWSS) in the results 3. For OSI calculation, use the formula after running the simulation in the results, First, create an expression: 0.5*(1-(sqrt(Wall Shear X.Trnavg^2+Wall Shear Y.Trnavg^2+Wall Shear Z.Trnavg^2)/Wall Shear.Trnavg )) Then create a variable using this expression.

To know if your answers are correct you need to do Validation study i.e., you have to select an experimental research paper and compare your results with the experimental data (such as Pressure, Cl. Cd, heat transfer etc). If it is in good agreement then it means your solver setup is proper and you can try out further analysis.

good morning Mr. Jafar Behtarinik

Thank you for your feedback....i will try this.

thank you again.

Sorry not familiar with udf profile writting. Hence, I cannot help :(

Please send me link for tutorials or examples....

ANSYS fluent is used for propeller simulation

You are welcome sir

I'm available for any collaborative workflow

Use wind tunnel, could find in mechanical engineering laboratory …..

Usually, temperature overshoots with radiation occur in skewed cells. Even if there is only one, then it propagates to the surrounding cells. So, maybe you can try to locally improve the mesh quality in the parts where this overshoot occurs.

Additionally, if it is not the case, ensuring that the angular discretization of the DO model is high enough (Theta and Phi divisions >= 3) could also help.

Farnaz Hosseini thank you madame for your interaction

This is what i thought too, can you describe the steps to calculate the parameters needed to calculate the nusselt.

There's two temperatures: the wall temperature and the mean(or mixing) temperature, i wanna make sure what i did is correct(i used the report definitions option to do this).

There's something confusing me: to calculate the nusselt number we need the heat flux exchanged betweeen the wall and the fluid can you tell me how to calculate it in fluent cuz i'm not sure about what i did.

Thank you again for your feedback madame.

Venkata Satyanarayana Initial temperature is 300K. The result of curve should be come in the range of 200k and pressure 0.6 mpa. If no issue, can we talk through a proper social media. I am thankful if you help me in this matter. your guidance important to me.

Hello Nitish Palanna ,

All you need to do is set the operating pressure to 0 and enter absolute pressure values for the boundary conditions.

Kind regards

Ashkan

Thank you for your answer,

If I use a PRESTO and second order to solve pressure , Momentum and energy equation with simple algorithm for velocity-pressure copling. How i can set up the underrelaxation factor?

Hi, I agree with Mohammad Rahjoo , did you check that at the outlet the Backflow Direction is set to "From Neighboring Cell" instead of the (old) default "Normal to Boundary"?

Which value is specified for the Backflow Temperature?

<patchName>

{

type fanPressure;

file "fanCurve";

outOfBounds clamp;

direction in; // in | out

p0 uniform 0;

value uniform 0;

// Optional entries

U U;

phi phi;

}

Francesca Folesani (1). In the main FLUENT window, on the left side under Results, Reports-Surface Integrals-Set Up. Set Report Type as Area-Weighted Average. Field Variable should be Pressure and Static Pressure by default, so leave those settings alone. Select both inlet and outlet under Surfaces, and Compute. The results are written to the main FLUENT window.

(2). Record the inlet and outlet pressures – these are gauge pressures averaged across the inlet and outlet faces, respectively.

Note: The outlet gauge pressure should be zero or nearly zero since we had specified (by default) the outlet boundary condition as zero-gauge pressure.

(3). Close the Surface Integrals window.

If you get any solution plz share with me too.

I am interested to work with you. Currently working in in the of Material science and Nanotechnology at Chinese Academy of Sciences. Feel free to contact me.

Is this boundary condition correct for this simulation?

Thank you for your interest! We have already found the candidate :-)

Hello Raaid Allam Sir, Greetings!

Is this error resolved?

I am also getting the same error. If your problem is fixed, kindly guide me in this regard and

Kindly mail me the possible ways to resolve this error,

My email id is sudeepns.197me025@nitk.edu.in

Looking forward to hearing from you.

I realdy did not undestand the question... but for whom read this after: some possibilies to post processing.

Tecplot are able to generate streamlines in 1, 2 or 3D velocity fields, all it will depends uopn from them are released. You can choose... there are at least fivr option do it. Under Analuzee TAB there is an option to generate particle paths amd streaklines.

On both you can inform the particle, radius, mass, initial velocity, drag coeficient and gravity acceleration modulus and direction.

For Particle path, if the particles have no mass, no gravity and drag are null, the result it will be the same as streamlines (they are generates as a MESH, you need turnon mesh viwe to see them) - if you have a unsteady flow ( changes on stremlines), I think the tecplot will calculate the trajectories from initial to end time. And Streakilines are transient in this conception, and the result are the same for particle paths but you can animate them! It is a lagrangeam post processing with one way coupling.

All them work from any dimension 2or 3D, steady or unsteady

CFD post, works for 3D always, even a 2D case is loaded - CFD Post was CFX Post in the past, and ANSYS CFX is alway 3D. There is some translation from FLUENT data do CDF-post, and a slim 3D geometry is created from 2D Fluent DATA. But you have a real 3D case genetare surface or volumetric Streamlines from where you want a plane, from point, lines, or any geometry entity you have created.

Particles trajectories are load as a other data file - Fluent and CFX generate this files and they need to be loaded after the case. This avoid crashes for a large numer of particles.

Oh, and there is ENSIGHT (CEI now ANSYS) - there is the same Tecplot approach.

You need to invoke continuity, momentum, energy (including phase change and porous media) equations in Ansys.

Hello, I'm doing the similar research. I think that it can be solved by ANSYS Fluent. May be we can discuss the question.

IronPython console can be used for adding expressions in ANSYS Fluent.

Velocity is defined as displacement over time. There are various expressions of this like dx/dt from calculus. If it is one-dimensional then you don't need root-of-sum-of-squares position (RSS of x, y & z positions) to determine displacement, it is simply X2 - X1, or the difference between final position (2) with respect to initial position (1). So you need some coordinate system for your dynamics problem. 1st rule of dynamics, always define your coordinate system. 2nd rule, develop a Free Body Diagram (FBD) of the object (or entity) in question as it resides within your coordinate system. The FBD must identify ALL externally applied forces acting upon the object/entity. Then you apply Newton's second law to the FBD, F=mA, where F is the summation of applied forces, m is mass and A is resultant acceleration. F and A are vector quantities, m is scalar mass (magnitude only, no direction). Choice of coordinate systems can simplify or overly-complicate the resulting equations. If you define the coordinate origin to be the initial position, it may simplify your governing equation. All of these considerations should be applied before any application of complex modeling tools such as ANSYS, in order to estimate an expected result and recognize unexpected results that need further explanation. Conceptual modeling must come before numeric, to avoid the risk of the common "garbage-in-garbage-out" scenario. The plate speed shouldn't exceed the particle speed of the wave, otherwise your model probably has violation of the laws of conservation in one form or another. Further, if your plate is 'unrestrained' or 'unconstrained', it will give you one answer, but if you try to extract work from it by making it push on a piston or or some other form of mechanical energy conversion for power extraction/generation, that restraint or constraint or impedance will reduce the resultant deflection of the plate. The force acting on the plate over the deflected distance form the product of work (W = F times D all in the same parallel or linear direction or degree of freedom). This product gives a theoretical maximum of the possible energy that may be extracted. Your actuator (piston or generator, whatever it is) will have a conversion efficiency less than unity (<100%) which must be applied in your considerations of power generating capacity. Power is work per time or dW/dt. Be mindful of dimensional units to check for dimensional correctness of any governing equations you derive while assessing the FBD, otherwise you will fall into the "garbage-in-..." trap.

First of all, you need to decide which modes should be included in your simulation, for example, convection, radiation, or all modes.

If you are interested in knowing the convection, for example, your simulation will give you the value of h, and based on it, you can calculate the convection.

Similarly, in radiation, you will need to know the (e) and so on.

Good luck

Good evening sir V. Antony Aroul Raj Mateo Kirincic .

Sir, I am working on a latent heat thermal storage system, and trying to validate an experimental paper.

Based on your above discussion, I am trying with the variable Cp method in fluent. But still in simulation, the melting rate is much more than the experimental one.

With due respect, can you suggest something?

Is it possible to use a udf for variable-specific heat with a rectangular profile?

Regards

Prakash Singh

Yes, kindly check out the attached picture for the mesh details.

Thank you.

Certainly! A person who is eloquent in more than one language is more likely to code-switch and mix up words from different languages within her L1. Language users be it consciously or unconsciously, seek facilitating things for themselves. Reasons for this interference vary:

1/ Similarities in pronunciation, grammar, vocabulary among languages systems like French, English, Spanish do play an important role in a multilingual society. The fact of knowing more than one language because of historical reasons, mixing up words become crucial when people communicate with others from different languages. A person who is fluent in French may easily mix up words when using English. The same thing happens to learners who mix up words from French when writing in or speaking English.

2/Language dominance: A bilingual speaker who uses the second language the whole day at work and with colleagues may not prevent herself from mixing up words when using her mother tongue at home.

3/ Prestige is another reason why people mix up words. For example, in Algeria people who uses French (a second language) words or sentences with Arabic is considered intellectual.

3/Actually languages interferences and code-witching occur even in the same language. For instance, a person who lives or works in an area which is far from home may be noticed since she uses different vocabulary and body language. The same thing happens to the same language user when words are mixed up using her own language at home.

please be sure that the physical model you defined particularly at tht interface of the boundaries are correct.

Sure, the focus study helps to find many special points of Strength in the language.

In ANSYS Fluent, resolve deforming mesh and zone definition issues by ensuring a proper setup. First, verify the mesh suitability for deformation, especially in relevant regions. Activate the deforming mesh option in the solution setup, specifying the correct deformation model. Clearly define zones, specifying deforming and stationary areas and ensuring proper connections. Set appropriate boundary conditions, paying attention to motion for moving or rotating boundaries. Check solver settings related to dynamic mesh and deformation, ensuring compatibility. Provide accurate initial conditions for deforming zones, including velocities and temperatures. Use Fluent's monitoring tools to visualize mesh deformation during simulation, aiding in issue identification. Careful review and consistency in zone definitions, boundary conditions, and solver settings are essential for a successful simulation.

It seems like you're facing a discrepancy between the strain rate contour obtained directly from Fluent and the one calculated using the expression (dV/dx + dU/dy). This could be due to various reasons, and troubleshooting such issues often involves checking several aspects of your simulation setup and post-processing. For example, the quality of mesh, the convergence study, and the good application of BC. Vibgyor Tash