Better to use QUICK than CDS for my case?

November 18, 2006, 04:12

Hello,

I'm trying to solve oscillating cylinder/moving airfoil case using my 2D FVM SIMPLE NS solver at Re~1e3-4. The results are ok for stationary bodies but for more complicated cases such as combined pitching oscillating airfoil, the results are not accurate for some cases. They differ by as much as around 20%.

Moreover, for some cases such as high pitching angles (>=30deg), the solution may deviate.

I wonder if using the QUICK scheme for my convective terms can improve the accuracy and stability ....

Thank you.

November 18, 2006, 09:30

Before adding QUICK I would verify that your code has no bugs in the moving body part. Are you maintaining geometric conservation? Are you computing the proper grid speeds and accounting for them in the flux terms? Are you using second-order accurate time discretization? In my experience changing the flux function from CDS to QUICK is not going to fix your problem (unless you have a problem with your original CDS scheme and it gets fixed inadvertently in going to QUICK).

November 18, 2006, 04:12	Better to use QUICK than CDS for my case?	#1
Ben Guest Posts: n/a	Hello, I'm trying to solve oscillating cylinder/moving airfoil case using my 2D FVM SIMPLE NS solver at Re~1e3-4. The results are ok for stationary bodies but for more complicated cases such as combined pitching oscillating airfoil, the results are not accurate for some cases. They differ by as much as around 20%. Moreover, for some cases such as high pitching angles (>=30deg), the solution may deviate. I wonder if using the QUICK scheme for my convective terms can improve the accuracy and stability .... Thank you.

November 18, 2006, 09:30	Re: Better to use QUICK than CDS for my case?	#2
ag Guest Posts: n/a	Before adding QUICK I would verify that your code has no bugs in the moving body part. Are you maintaining geometric conservation? Are you computing the proper grid speeds and accounting for them in the flux terms? Are you using second-order accurate time discretization? In my experience changing the flux function from CDS to QUICK is not going to fix your problem (unless you have a problem with your original CDS scheme and it gets fixed inadvertently in going to QUICK).

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