Inlet Pressure...
 

Hi guys,

I have got a channel (diameter 110m) and at the inlet I need to specify gas flow rate (for example 1LPM) and pressure as well (for example 100Pa). Is there any way to specify both at the same time?!

Not really but when you set a mass flow you can work with temperature of the gas.
But you have to set all gas properties on temperature-sensitive - viscocity is important.