Run time post processing vs Post run post processing

pruthvi1991 · February 19, 2015, 14:02

Hi all.

I'm simulating a flatplate in cross flow using pimpleFoam. My mesh seems to be fine. I got the results for Cx and Cy and later on decided to use a different value of Aref. So I changed the Aref value and ran execFlowFunctionObjects to calculate the force Coeffs. The results I got are not as expected. To depict the difference in results I used the same scale as was used for run time postprocessing and plotted the results again.

Take a look at the plots below. I'm unable to explain why the periodicity of the force Coeffs has changed. Both graphs should be the same instead they are different.

Inconsistent_forcedata.png

I'm also adding residual data and a checkMesh log.

linear.png

courant.png

cont.png

forceCoeffs.txt

Inconsistent_forcedata.png

pruthvi1991 · February 19, 2015, 15:15

I found the answer guys. Run time post processing has access to all the timesteps. Post run post processing has access to only the written time steps. Sorry for the post.

February 19, 2015, 14:02	Run time post processing vs Post run post processing	#1
pruthvi1991 Member Pruthvi Join Date: Feb 2014 Posts: 41 Rep Power: 12	Hi all. I'm simulating a flatplate in cross flow using pimpleFoam. My mesh seems to be fine. I got the results for Cx and Cy and later on decided to use a different value of Aref. So I changed the Aref value and ran execFlowFunctionObjects to calculate the force Coeffs. The results I got are not as expected. To depict the difference in results I used the same scale as was used for run time postprocessing and plotted the results again. Take a look at the plots below. I'm unable to explain why the periodicity of the force Coeffs has changed. Both graphs should be the same instead they are different. Inconsistent_forcedata.png I'm also adding residual data and a checkMesh log. linear.png courant.png cont.png forceCoeffs.txt Inconsistent_forcedata.png

February 19, 2015, 15:15	Found the answer	#2
pruthvi1991 Member Pruthvi Join Date: Feb 2014 Posts: 41 Rep Power: 12	I found the answer guys. Run time post processing has access to all the timesteps. Post run post processing has access to only the written time steps. Sorry for the post.

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