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# Rarefied Gas Dynamics - Science topic

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Questions related to Rarefied Gas Dynamics

I am trying to create an impact pressure probe to measure spatial distribution of free stream pressure of a jet plume exiting to a rarefied medium. I found out that sankovich pressure probes is best suited for my purpose. Kindly provide the dimensional details of the above mentioned probe.

Greetings, I am trying to understand how the information travels in subsonic flows from a microscopic perspective. From computational physics point of view, the flow field can be described as elliptic in nature and there are no real characteristics. I know that every point in the flow field depends on every other point in the flow field implying it eventually depends on the boundaries of the flow field if there exist any.

Assuming a flow field at rest, if a disturbance is introduced into the system the information propagates through pressure waves. But from a microscopic point of view, I can only imagine information propagating by collisions with particles. But is it the complete the picture of it ? Because in Direct Simulation Monte Carlo method, the velocities before and after collisions cannot be correlated and i don't seem to understand the information travel.

Am i failing to understand something deeper on the information travel in subsonic flows ?

P.S. I am trying to understand this for application in micro-fludics using DSMC method.

CD is the ratio of actual flow rate to the theoretical flow rate

So, how can we calculate the theoretical flow rate?

Hello all,

I have worked with FVM for solving Navier Stokes Equation. As we go down at microscale or even smaller and encounter rarefied gas flow, to the bets if my knowledge there would be different set of equations that may be required to solve.

Is it possible to use FVM methods in such cases also?

What about LBM method for the same?

Thanks