I have tried to model shock tube in ansys fluent but I am not getting good results. My model is as follows:

Shock tube : Geometry : Circular tube of Internal Diameter = 800 mm

Bursting Pressure of Diaphragm= 10 MPa (P4)

Driver Gas = Air

Driven Gas= Air

Ambient Pressure=0.101325 MPa

T4=310 K

T1=310 K

Driver Length= 6m

Driven Length=6m

Boundary Conditions in Ansys:

Cylinder wall= wall

In my Case there is no end wall so this is open shock tube and I have model it as outlet, Non reflecting surfaces and set gauge pressure=0

To apply P4  and P1 in zone 4 and zone 1, I have used adapt > region (define regions) > initialize> patch for both zones.

after solving I am not getting correct result. Please Some body help me in modelling shock tube in ansys (I have not model diaphragm in it)??

Thanks and Regards,

SUMAN KUMAR