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Sod shock tube using dsmcFoam - Help

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Old   December 5, 2021, 12:23
Default Sod shock tube using dsmcFoam - Help
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Melania
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Hi everyone!
I'm trying to simulate the Sod shock tube using the particle-based method called dmscFoam.

I'm new with OpenFOAM and C++ language, so I'm having some trouble using it.
I've set the initial conditions of pressure,density and temperature but the results are not the expected ones.

Did anyone try to do this simulation?

if someone can help me, I would appreciate it.
Thank you so much!
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Old   December 15, 2021, 22:38
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In sod shock tube problem, the density, velocity, and temperature is macroscopic variables, and the reference solution is calculated by Riemann solver; while DSMC is a particle method, which is mainly used in rarefied flow. If the DSMC method is used for the problems in continuum flow, a lot of particles is needed. So, why use DSMC solver for the sod shock tube problem?
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Old   December 17, 2021, 11:13
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Quote:
Originally Posted by xjyang View Post
In sod shock tube problem, the density, velocity, and temperature is macroscopic variables, and the reference solution is calculated by Riemann solver; while DSMC is a particle method, which is mainly used in rarefied flow. If the DSMC method is used for the problems in continuum flow, a lot of particles is needed. So, why use DSMC solver for the sod shock tube problem?

Hi xjyang, thank you for answering!

This is actually a work for my master thesis: I'm trying to simulate basically a continuum flow with this discrete method. I know about the amount of particles that have to be used for the simulation. Do you have any tip?
You would be really helpful, since I'm having some trouble with the solver and I'm new with OpenFOAM.
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Old   December 18, 2021, 09:47
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A validation tutorial of Sod's shock tube using rhoPimpleFoam:

http://www.wolfdynamics.com/tutorials.html?id=150

Hope this helps a bit (though not direct answer to your questions)
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