- **Main CFD Forum**
(*http://www.cfd-online.com/Forums/main/*)

- - **Compressible Flow problem**
(*http://www.cfd-online.com/Forums/main/102800-compressible-flow-problem.html*)

Compressible Flow problemHello 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 |

All times are GMT -4. The time now is 14:45. |