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basic fluid dynamics question: Flow though time |
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May 14, 2020, 19:24 |
basic fluid dynamics question: Flow though time
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#1 |
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niewiemnic
Join Date: Jan 2018
Location: Niemcy
Posts: 80
Rep Power: 8 |
Hello,
let we think we simulate air flow on an airfoil. The length of airfoil is 1 m. And the CFD-Domain has 30 m in the direction of the flow. Velocity is 30 m/s. then in this case, my flow though time is... 1. 1 s? or 2. 1/30 s? I think 1/30 s is right... |
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May 14, 2020, 20:06 |
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#2 |
New Member
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I'd say that is completely up to you, if you want it to be a complete domain flow-through or an airfoil flow-through. For my work on channel flows we define a flow-through as the time it takes from the domain inlet to the domain outlet, but your problem is different.
Also, if such accuracy would be desired, remember that the flow-through time for the suction surface of the airfoil will be shorter than for the pressure surface, but I doubt that level of accuracy is what you're looking for! |
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May 15, 2020, 02:32 |
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#3 |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,682
Rep Power: 66 |
Flow thru time is 1 s. 1/30 seconds isn't the right answer, it's wishful thinking.
It's the same as channel flow, the initial condition needs to get washed out completely |
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