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Rearward Step (Base Flow)

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Old   October 12, 2008, 01:31
Default Rearward Step (Base Flow)
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cfdxue
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Recently I have solved rearward step (backward step, base flow) problem. I compare results of TVD, ACM, and Experimental. Just after step, TVD (Yee-Davis) is predicting low pressure ratio (P/Pinf) while ACM44 is predicting very accurate results . But in downstream region both schemes (TVD and ACM44) over predicting pressure ratio.

May you please explain me that:

1. After step, why TVD is predicting low pressure ratio (P/Pinf) while ACM44 is predicting very accurate results???

2. At downstream region, both schemes (TVD and ACM44) over predicting pressure ratio???

Thanks and Regards
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