[devshi]

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.

[FMDenaro]

Originally Posted by devshi

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

[devshi]

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.

[FMDenaro]

Originally Posted by devshi

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

[devshi]

Originally Posted by FMDenaro

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.