# N.Mohammed NiyasdeenPusan National University | PNU · Department of Aerospace Engineering

N.Mohammed Niyasdeen

Doctor of Philosophy

Modeling a real-gas Flamelet solver for high-pressure combustion system + liquid-fuel-based Rotating Detonation Engine.

## About

26

Publications

8,498

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93

Citations

Citations since 2017

Introduction

Working on developing a real-gas Flamelet solver for high-pressure combustion systems with detailed chemical kinetics.
Area of Expertise: Reacting Flow CFD, Turbulent Combustion, Rotating Detonation Engines (RDEs), High-pressure Combustion, High-performance Computing, Chemical Kinetics of super-critical fluids.

Additional affiliations

September 2016 - August 2020

August 2014 - March 2016

Education

April 2014 - March 2016

September 2009 - March 2013

## Publications

Publications (26)

The dynamic feature of the detonation wave is characterized by the cell structure formed by the traces of triple points in the detonation wave-front and transverse shock wave behind the detonation wave. In this paper, detonation wave is numerically traced by the local maximum pressure and the fully resolved results for the dynamic structure of the...

An annulus is a configuration characterizing the cross-section of a rotating detonation engine (RDE), and the dimensionless radius is a unique geometric feature of the annulus. The present study examines the effects of the dimensionless radius of the annulus on the detonation wave propagation characteristics in an RDE. The concept of a helical comp...

The theoretical finding of the Sanal-flow-choking [PMCID: PMC7267099] is a methodological advancement in predicting the deflagration-to-detonation-transition (DDT) in the real-world-fluid flows (continuum/non-continuum) with credibility.[1,2] Herein, we provide a proof of the concept of the Sanal-flow-choking and streamtube-flow-choking causing DDT...

The theoretical finding of the Sanal-flow-choking [PMCID: PMC7267099] and streamtube flow choking (V.R.Sanal Kumar et al., Physics of Fluids, Vol.33, No.3, 2021, DOI: 10.1063/5.0040440) are methodological advancements in predicting the deflagration-to-detonation-transition (DDT) in the real-world-fluid flows (continuum/non-continuum) with credibili...

We discovered through theoretical studies that, at the creeping inflow conditions, any chemical rocket having port with the sudden expansion / divergent could predispose to deflagration-to-detonation-transition (DDT) at a critical total-to-static pressure ratio (TSPR) due to the phenomenon of Sanal flow choking. At the Sanal flow choking condition,...

In this proposal, the enhancement of the performance characteristics of high-performance-aircraft using auxiliary afterbody thruster assembly will first be investigated numerically using computational fluid dynamics (CFD) modeling. Key parameters such as force and moment coefficients will be involved. The CFD method will be implemented by testing b...

In this paper analytical and numerical predictions of boundary layer blockage at the Sanal flow choking condition for diabatic flows have been carried out. The Sanal flow choking is a unique condition of any internal flow system at which both the thermal choking (Rayleigh flow effect) and the wall-friction induced flow choking (Fanno flow effect) o...

A closed-form analytical model is developed for estimating the 3D boundary-layer-displacement thickness of an internal flow system at the Sanal flow choking condition for adiabatic flows obeying the physics of compressible viscous fluids. At this unique condition the boundary-layer blockage induced fluid-throat choking and the adiabatic wall-fricti...

Present paper focuses on the comprehensive survey of Rotating Detonation Engine (RDE) and their research from the basic to the advanced level. In this paper, an abridged archival background of Pulse/Rotating Detonation Engine (PDE/RDE) is briefed. This is followed by a short description of a Continuous Spin Detonation (CSD) and a few essential fact...

Fluid dynamic constant volume combustion technology detonation has been paid attention as a “game-changing” technology to overcome the efficiency and performance limitation of the present constant pressure combustion systems. For the past several years, a number of experimental and CFD-based theoretical studies have been conducted for the basic ope...

Fluid dynamic constant volume combustion technology detonation has been paid attention as a "game-changing" technology to overcome the efficiency and performance limitation of the present constant pressure combustion systems. For the past several years, a number of experimental and CFD-based theoretical studies have been conducted for the basic ope...

The concept of the pintle technology received considerable attention in the aerospace industry due to its controllable thrust propulsion capability. In this paper, we have carried out detailed numerical studies on the conceptual design and the geometry optimization of a pintle for the acceleration, the deceleration and the steering of rockets. The...

The design optimization of cavity based scramjet combustor is an active research topic worldwide. In this paper an attempt has been made to increase the combustor efficiency of the scramjet combustor by introducing multiple bumps facilitated in its cavity for increasing the residence time within the given envelope lucratively. The comprehensive num...

The flow physics of insect's flapping is of topical interest due to varieties of industrial applications. This topic has been investigated from biological, biomechanical, morphological and fluid dynamics aspects by several investigators. One such problem of current interest to the aerodynamic industry is to examine various insects' inherent capabil...

We performed a numerical simulation based on the two-dimensional (2-D) unsteady Euler’s equation with a single-step Arrhenius reaction model in order to investigate the detonation wave front propagation of an Argon (Ar) diluted oxy-hydrogen mixture (2H2 + O2 + 12Ar). Tis simulation operates in the detonation frame of reference. We examine the effec...

The accelerated growth in aircraft industries desire effectual schemes, programs, innovative designs of advanced systems and facilities to accomplish the augmenting need for home-free air transportation. In this paper, a contemporary conceptual design of a cambered airfoil has been proposed in order to providing augmented effective lift force relat...

The accelerated growth in aircraft industries desire effectual schemes, programs, innovative designs of advanced systems to accomplishing the augmenting need for home-free air transportation. In this paper, a contemporary conceptual design of an airplane has been proposed without landing gear systems in order to reducing accidents, time consumption...

turbine engines require better cooling techniques to retaining its magnetic properties. In this paper experimental characterization of four-pole 5 Newton (N) laboratory model of AMB is carried out at a maximum voltage of 11 volt (V) and a current of 1.78 ampere (A) at an operating temperature of 303–333 Kelvin (K) for an operating period of one hou...

## Questions

Questions (20)

Hi everyone,

I have a fundamental question related to the movement of a particle and wave.

I understand that both particles and waves are entirely different and independent. However, how do they behave just after the shock wave (a detonation wave maybe)?

If you wholly zoom in and see both particles and waves just after the shock wave, will they behave completely independently or move towards the shock?

Thanks

Hello everyone!

I want to draw a huge flowchart for my computer code. Inside the flowchart, I want to write equations and notes.

Is there any specific software for that?

Hello everyone!

I want to simulate a premixed combustion case with Hydrogen/air (or oxygen) chemistry.

I know simulating a non-premixed combustion case with hydrogen/air detailed chemistry means injecting hydrogen as fuel and air as oxygen at a particular temperature and pressure and using any available chemical mechanism (GRI, UCSD, etc...).

But, what is meant by simulating premixed combustion with detailed chemistry?

Hello everyone,

Recently I looking into beta PDF and log-normal PDF.

In the process of learning those, I frequently come across some terms such as conditional PDF, marginal PDF, presumed PDF, transport PDF, etc...

So where can I learn the fundamentals of these terms?

Theoretically speaking, when subsonic reactant flow passes through strong deflagration waves (strong expansion waves), the products must be in supersonic speed. But this is not possible because it violates the thermodynamics second law.

Can anyone please explain how?

Why is StarCCM+ popular among industry researchers and ANSYS is more popular among academic researchers?

Is there any specific reason?

I have a question related to scalar and vector.

In a computational simulation, we have spatial gradient terms.

One such term is called the spatial gradient of the mass fraction of the fuel and oxidizer.

My question is that this term (spatial gradient of the mass fraction) is a scalar or vector?

Thanks

The job of the shock in the detonation engine with respect to the ZND model is to increase the temperature downstream of the shock to a high enough level for the reaction rate to happen as fast as it can and follow the shock.

But, a shock is only a few mean paths thick which is not sufficient for a significant amount of collisions to happen between the reactants for the appreciable reactions within the shock.

If there is no collision between atoms inside the shock, then exactly how the shock increases the temperature of the reactants? What is the structure of the shockwave here?

In diesel engine or stratified charge engine combustion which has changing bulk pressure.

What is mean by bulk pressure here?

## Projects

Projects (3)