Fluid Dynamics case
 

Hi,

I am simulating a cylinder model with a nozzle in the middle which introduces Helium and the air surrounding the nozzle. I tried to read and find any case quiet similar to my case. But, I have failed many times to simulate it well.
One of the tutorial is quiet similar, but I would like to ask everybody whether it is possible to disable the Energy Equation button?

Please somebody help me....

Thanks in advance.