Oscillating Flat Plate using Pseudo compressibility (Stokes boundary layer)

Shiv1510 · May 1, 2019, 13:29

Hi everyone !

I am new to CFD online and I hope this is the right Forum to ask a questions regarding concepts and cfd codes.
I have written a working Fortran code for Laminar Unsteady Flow over flat plate for incompressible fluid using method of Pseudo-Compressibility. I am solving Full NS equations.

Now I want to covert the same to solve for oscillating flat plate of infinite length (Stokes second problem) using full NS equations. I have a simple square domain, with plate as bottom wall. I am having trouble figuring it out what should be the boundary condition for u, v and p at right and left wall ? I was looking to use periodic boundary conditions, but was wondering if that would make my problem ill-posed. Also if I use periodic boundary condition, what would be my pressure boundary conditions on left and right wall ?

Any help would be appreciated !! Hope this interest anyone.

Thanks

djr4cfd · July 14, 2019, 11:04

I also have the same question. I would appreciate, if anybody answers this.

FMDenaro · July 14, 2019, 12:06

Periodic BCs are possible, the simulated flow is a time-evolving not a spatially evolving BL.

An oscillating pressure can be set as forcing term in the momentum equation

May 1, 2019, 13:29	Oscillating Flat Plate using Pseudo compressibility (Stokes boundary layer)	#1
Shiv1510 New Member Shivank Join Date: May 2019 Posts: 27 Rep Power: 7	Hi everyone ! I am new to CFD online and I hope this is the right Forum to ask a questions regarding concepts and cfd codes. I have written a working Fortran code for Laminar Unsteady Flow over flat plate for incompressible fluid using method of Pseudo-Compressibility. I am solving Full NS equations. Now I want to covert the same to solve for oscillating flat plate of infinite length (Stokes second problem) using full NS equations. I have a simple square domain, with plate as bottom wall. I am having trouble figuring it out what should be the boundary condition for u, v and p at right and left wall ? I was looking to use periodic boundary conditions, but was wondering if that would make my problem ill-posed. Also if I use periodic boundary condition, what would be my pressure boundary conditions on left and right wall ? Any help would be appreciated !! Hope this interest anyone. Thanks djr4cfd likes this.

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July 14, 2019, 11:04		#2
djr4cfd New Member djr4cfd Join Date: Jan 2018 Posts: 13 Rep Power: 8	I also have the same question. I would appreciate, if anybody answers this.

July 14, 2019, 12:06		#3
FMDenaro Senior Member Filippo Maria Denaro Join Date: Jul 2010 Posts: 6,849 Rep Power: 73	Periodic BCs are possible, the simulated flow is a time-evolving not a spatially evolving BL. An oscillating pressure can be set as forcing term in the momentum equation