# Setting Time Step of LES

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 January 30, 2013, 10:45 Setting Time Step of LES #1 New Member   Daeung Kim Join Date: Jan 2013 Posts: 3 Rep Power: 6 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

 January 30, 2013, 12:31 #2 Senior Member     siamak rahimi ardkapan Join Date: Jul 2010 Location: Copenhagen, Denmark Posts: 218 Rep Power: 10 Do you know how long does it take to air flow enter and then leave the domain? __________________ Good luck Siamak

 January 30, 2013, 12:38 #3 New Member   Daeung Kim Join Date: Jan 2013 Posts: 3 Rep Power: 6 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 Last edited by daeung44; January 31, 2013 at 13:41. Reason: duplication

January 30, 2013, 12:42
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Daeung Kim
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Quote:
 Originally Posted by siara817 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

 February 1, 2013, 06:27 #5 Senior Member     siamak rahimi ardkapan Join Date: Jul 2010 Location: Copenhagen, Denmark Posts: 218 Rep Power: 10 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. __________________ Good luck Siamak

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