Flow Around four cylinders in square configuration

shzinwoyk · April 12, 2015, 17:13

Hello friends,

I am working on a problem for a long time. but I am having problems with the results. I would like to hear your views on this subject.

I briefly describe the problem:

4 square cylinder placed in square condition. 1 and 2 of the cylinder's front. 3 and No. 4 cylinders behind. y + = 1 and k-omega SST model is used. time step size is 0.002. Re = 8000.

results true for cylinders 1 and 2. but I get an error in the range of 50-80% for cylinders 3 and 4.

I've got two pieces of mesh. screenshotts is down. (inlet and outlet are shown opposite)

The green example: Calculated Cd value lower than the value that should be,
Purple in color example: Calculated Cd value higher than the value that should be read.

Waiting for your help in order to establish the correct model.

thanks

fluid23 · April 13, 2015, 17:44

Your photos are not visible.

Can you share what you are comparing your results against? How do you know the aft cylinders are off by 50%-80%?

April 12, 2015, 17:13	Flow Around four cylinders in square configuration	#1
shzinwoyk New Member alper yıldırım Join Date: Feb 2014 Posts: 10 Rep Power: 12	Hello friends, I am working on a problem for a long time. but I am having problems with the results. I would like to hear your views on this subject. I briefly describe the problem: 4 square cylinder placed in square condition. 1 and 2 of the cylinder's front. 3 and No. 4 cylinders behind. y + = 1 and k-omega SST model is used. time step size is 0.002. Re = 8000. results true for cylinders 1 and 2. but I get an error in the range of 50-80% for cylinders 3 and 4. I've got two pieces of mesh. screenshotts is down. (inlet and outlet are shown opposite) The green example: Calculated Cd value lower than the value that should be, Purple in color example: Calculated Cd value higher than the value that should be read. Waiting for your help in order to establish the correct model. thanks

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April 13, 2015, 17:44		#2
fluid23 Senior Member Matt Join Date: Aug 2014 Posts: 947 Rep Power: 18	Your photos are not visible. Can you share what you are comparing your results against? How do you know the aft cylinders are off by 50%-80%?