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Setting Time Step of LES

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Old   January 30, 2013, 10:45
Default Setting Time Step of LES
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Daeung Kim
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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
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Old   January 30, 2013, 12:31
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siamak rahimi ardkapan
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Do you know how long does it take to air flow enter and then leave the domain?
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Old   January 30, 2013, 12:38
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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
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Old   January 30, 2013, 12:42
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Quote:
Originally Posted by siara817 View Post
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
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Old   February 1, 2013, 06:27
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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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