How to get an accurate CFD solution to aeroheating problem for hypersonic flows?

Leining D · April 12, 2009, 11:49

Hi, everyone:
I am glad to disscuss CFD with you.
I am puzzled with a proplem, which is how to get an accurate CFD solution to aeroheating on body with hypersonic velocity. In my work,I found that heating flux on wall obtained by CFD had large errors comparing with experimental data. Do you have any ideas about that?
Thanks!

harishg · April 12, 2009, 13:17

If your mach number is > 5 your equations change due to dissociation of molecules. Assuming its less than 5 what numerical scheme do you employ ?

gory · April 12, 2009, 21:54

If the grid is unstructured, a current standard FV code has a big trouble in heating prediction even for a very simple geometry like a 2D cylinder, which I learned from this paper:

Computational Aerothermodynamics Simulation Isues on Unstructured Grids, Peter A. Gnoffo and Jeffery A. White, AIAA-2004-2371, June 2004.

Leining D · April 13, 2009, 08:37

Quote:

Originally Posted by harishg

If your mach number is > 5 your equations change due to dissociation of molecules. Assuming its less than 5 what numerical scheme do you employ ?

In my problem,Mach number is equal to 10 and the body is a cone with blunt nose. It is supposed to be a simple shape with simple mesh. Because experimental data is from shock wind tunnel in which experimental time is very short, high temperature effect such as dissociation of molecules should not be present. Therefor, I think that emoloying Navier-Stokes equations in perfect gas as governing equations is reasonable. The scheme I used is Roe's splitting +MUSCL with Minmod Limiter. Do the scheme result in large error?
Thank you!

Leining D · April 13, 2009, 08:42

Quote:

Originally Posted by gory

If the grid is unstructured, a current standard FV code has a big trouble in heating prediction even for a very simple geometry like a 2D cylinder, which I learned from this paper:

Computational Aerothermodynamics Simulation Isues on Unstructured Grids, Peter A. Gnoffo and Jeffery A. White, AIAA-2004-2371, June 2004.

My grid is structured. Do you have any suggestion?
Thank you!

harishg · April 14, 2009, 12:26

I worked in a group where people did similar simulations for a blunt nose with structured grid and obtained pretty good results. I do not remember the numerical scheme they exactly employed but its either ENO or Godunov scheme with a TVD R-K method. I have seen some simulations in AIAA journal which shows the successful application of ENO schemes for flows with shock. MUSCL might be highly dissipative but if you have experimental results, you can always check the contours to see the ability of the scheme.

April 12, 2009, 11:49	How to get an accurate CFD solution to aeroheating problem for hypersonic flows?	#1
Leining D New Member Leining D Join Date: Apr 2009 Posts: 7 Rep Power: 17	Hi, everyone: I am glad to disscuss CFD with you. I am puzzled with a proplem, which is how to get an accurate CFD solution to aeroheating on body with hypersonic velocity. In my work,I found that heating flux on wall obtained by CFD had large errors comparing with experimental data. Do you have any ideas about that? Thanks!

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April 12, 2009, 13:17		#2
harishg Senior Member N/A Join Date: Mar 2009 Posts: 189 Rep Power: 17	If your mach number is > 5 your equations change due to dissociation of molecules. Assuming its less than 5 what numerical scheme do you employ ?

April 12, 2009, 21:54		#3
gory Member Join Date: Mar 2009 Posts: 32 Rep Power: 17	If the grid is unstructured, a current standard FV code has a big trouble in heating prediction even for a very simple geometry like a 2D cylinder, which I learned from this paper: Computational Aerothermodynamics Simulation Isues on Unstructured Grids, Peter A. Gnoffo and Jeffery A. White, AIAA-2004-2371, June 2004.

April 14, 2009, 12:26		#6
harishg Senior Member N/A Join Date: Mar 2009 Posts: 189 Rep Power: 17	I worked in a group where people did similar simulations for a blunt nose with structured grid and obtained pretty good results. I do not remember the numerical scheme they exactly employed but its either ENO or Godunov scheme with a TVD R-K method. I have seen some simulations in AIAA journal which shows the successful application of ENO schemes for flows with shock. MUSCL might be highly dissipative but if you have experimental results, you can always check the contours to see the ability of the scheme.