Hi

I had posted already about my doubt of not plotting. But it seems nobody has faced such problem.

I suppose, there might be something wrong in the way i tried to do the simulation of shocktube.can someone gimme more hint.?

here is the procedure i followed to setup shocktube... such as ...... made a duct of L/D=10, unsteady, 2d, implicit, energy enabled, 2nd order upwind pressure inlet=500 kPa and pressure outlet=125kPa, and also patching with the same two pressures in two different zones, having one interface as interior. Iterate with 1e-5 and performed 2000 iterations. Grid=25,000 in one meshfile and another meshfile with gird=548,904 cells. both meshfiles were attempted but no useful result.

The residual is plotted and it shows me a series of high frequency sinewave, besides, it says it is converged whenever it is on the bottomside-axis of sinewave.

Am I missing something. The result doesnot show shock-propagation and also it doesnot plot.

Please help.

thanks

Since the flow needs to be treated as compressible, just wanted to make sure if you switched to ideal gas law?

yes sir, i did switch on the compressible by enabling ideal gas law.

Please gimme more details to resolve it..

I dont know where I am going wrong.

please help

Select Density Based Solver( Coupled Solver older version). Set density by ideal gas law. Rgds

[jackmarlowe]

How do we patch different Pressure values to two neighbouring fluid zones?

I guess I am trying to solve the very same problem. I want to see an unsteady shock wave and an expansion wave in my shock tube analysis but I need two fluid zones with distinct pressure values.

Edit: Well I found how to do so, sorry for that. It was under where we initialize the solution. I patched different pressure values for driver and driven zones. It seems like it is a tough question thou, I am not sure which turbulence model to use. First tried Spalart-Almaras since the main concept is about fast flowing fluids but it had dozens of problems (divergence, turbulence, pressure). I am giving a shot to inviscid flow.