[Saikat_FM]

I am using ANSYS Fluent 15.07 for my simulation work. I am currently working on 1D shock tube problem. Shock tubes as you all know is a long tube, have a membrane type of thing in the middle. The membrane separates the two sides which have different pressures and densities. Actually one side of the tube has a high pressure and the other side has a low pressure. Flow is initiated by the rupture of the membrane due to the pressure difference. My particular problem is that, I am unable to give different densities for the two portions of the shock tube using Fluent. How can I give two different densities for the two sections of the shock tube using Fluent ? I have found out that whenever I am giving a specific density to one particular side, the other side of the tube is also taking that same density by default.