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Old   December 7, 2017, 14:45
Default Periodic flow pressure drop
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Devshi Ziyad
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Hello,

I have simulated periodic flow across a channel. with wall on one side and periodic flows on two sides. Since it is periodic flow, pressure drop is zero. And the only condition given is velocity initial condition in x direction. Can you tell me, how I can find pressure drop across the domain in this case.

Thanks.
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Old   December 7, 2017, 15:08
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Filippo Maria Denaro
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Originally Posted by devshi View Post
Hello,

I have simulated periodic flow across a channel. with wall on one side and periodic flows on two sides. Since it is periodic flow, pressure drop is zero. And the only condition given is velocity initial condition in x direction. Can you tell me, how I can find pressure drop across the domain in this case.

Thanks.
Similar questions in the forum had answers useful for you. The constant pressure drop is a forcing term you have to fix in the streamwise component of the momentum equation
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Old   December 7, 2017, 15:12
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Devshi Ziyad
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Thank for your reply. Actually I dont have problem in simulating the flow. In post processing I want to find wall-shear stress. For that I require pressure loss.
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Old   December 7, 2017, 15:41
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Thank for your reply. Actually I dont have problem in simulating the flow. In post processing I want to find wall-shear stress. For that I require pressure loss.

wall stress (tau_wall) is computed by the velocity gradient at the wall
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Old   December 8, 2017, 11:01
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wall stress (tau_wall) is computed by the velocity gradient at the wall
Yes, I completely agree with that. thanks.

I was wondering if pressure gradient is not specified beforehand, and just volume flow rate is specified, how do I get the pressure gradient across the domain.
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channel flow, periodic bc, pressure drop

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