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Old   January 20, 2002, 22:49
Default MARS discretization scheme
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raymond
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Does anyone have some experiences with MARS discretization shcee? I have tried it in the buoyancy flow as suggested by STAR-CD manual. But at some locations I got negative value of temperature where I define the initial and amibient temperatrue is positive throughout the whole domain. When I changed to SFCD scheme, all look correct.

In the methodology manual, I could not find the detailed information about the MARS scheme, do anyone have the same experience with me and tell me what's the limitation of MARS scheme?

Thanks!
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Old   January 28, 2002, 06:05
Default Re: MARS discretization scheme
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Anton Lyaskin
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As I remember, MARS scheme is advised for momentum equations. For temperature and dencity SFCD is recommended.

I use MARS for momentum and turbulence and whould like to know more about it, too.
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Old   January 28, 2002, 19:57
Default Re: MARS discretization scheme
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raymond
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Thanks for your suggestion!

But in the tutorial of STAR-CD, (10.1) It was suggested that the MARS is applied for UVW and T and DENS, and turbulence energy and dissipiancy are using UD scheme. Is there any other suggestion for it?
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Old   February 1, 2002, 05:33
Default Re: MARS discretization scheme
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Anton S. Lyaskin
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I've never tried MARS for T and DENS, I use SFCD for them. And for some problems I couldn't get convergence with UD for turbulence.

I've tried different schemes for a laminar flow in a square duct with 90 degrees turn. MARS makes little difference with QUICK.
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