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-   -   Setting Time Step of LES (https://www.cfd-online.com/Forums/star-ccm/112526-setting-time-step-les.html)

 daeung44 January 30, 2013 10:45

Setting Time Step of LES

Hi, I'm a graduate student of Architecture so, my background is not mechanical eng. Due to this, I can do STAR CCM+ as a routine for building application. However,I'm trying to use LES but I can't figure out how I can setup maximum physical step in STAR CCM+.

My work is to simulate wind tunnel with just cubic model. Is there anyone to tell me setup general physical time and inner iterations?

Danny

 siara817 January 30, 2013 12:31

Do you know how long does it take to air flow enter and then leave the domain?

 daeung44 January 30, 2013 12:38

I assume that 100mph blows. So, it might take 1~2sec. But I'm not sure. Do I have to calculate the physical time?

The air enters to X direction and its speed is just 44.7m/s. The domain size is 180m*340m*66m(h). The number of mesh is about 300,000.

Danny

 daeung44 January 30, 2013 12:42

Quote:
 Originally Posted by siara817 (Post 405092) Do you know how long does it take to air flow enter and then leave the domain?
I assume that 100mph blows. So, it might take 1~2sec. But I'm not sure. Do I have to calculate the physical time?

The air enters to X direction and its speed is just 44.7m/s. The domain size is 180m*340m*66m(h). The number of mesh is about 300,000.

Danny

 siara817 February 1, 2013 06:27

Dear Kim,

I think if you consider 0.01 second, it would be fine. However check the courant number for your solution. See what is the courant number range.

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