# Compressible Flow problem

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 June 2, 2012, 18:36 Compressible Flow problem #1 New Member   Rahul Verma Join Date: Jan 2012 Location: Mumbai Posts: 7 Rep Power: 5 Hello Everyone, I am solving compressible problems with pressure correction approach. I have derived pressure correction equation for unsteady compressible case and solved 2-Dimensional shock tube problem with implicit scheme. Full Navier equation is used as governing equation. This is my first case and it is working for pressure ratio 5 to 15. with both staggered and collocated approach. This case is perfectly working with variation of grid size, relaxation parameter. So this case is perfectly working for me. Now problem comes, I am trying to solve this for plane channel flow case(2D fanoo flow). Here is detail Boundary condition: For velocity : Inlet velocity is defined No slip boundary condition is used for upper and lower wall For exit boundary i am taking derivative equal to zero. dU/dx=0 dV/dx=0 For Temp : Inlet Temp is fixed for walls dT/dy=0 for exit dT/dx=0 For Pressure: Since we are not using any pressure boundary condition in SIMPLE, i am also not using in my case, But in compressible case i need boundary pressures and density. So for this i am using dP/dy=0 for walls and dP/dx=0 for inlet and outlet for density: No boundary condition is required, calculating by gas law p/RT This is my problem and this is not working. Same formulation is perfectly working for shock tube case but not giving correct results for channel case I think there might some issues with boundary because in both cases boundary has changed. Please let me know what should i do for this Thanks & Regards, Rahul Verma IIT Bombay

 Tags boundary conditions, compressible flow, simple algorithm

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