[manjuc]

I'm trying to simulate a flow through a channel with a pressure-far-field inlet (the flow is compressible so I can't use a velocity inlet) and a pressure-far-field outlet. At the inlet boundary condition, my gauge pressure is 0, my Mach number is 2, and my temperature is 288.15 K. At the outlet boundary condition, based on my calculated values, my gauge pressure is 606174 Pa, my Mach number is 0.3306, and my temperature is 507.53 K. However, I am running into some trouble when I set my initial values. If they're too close to the inlet values (or somewhere in the middle), then my residuals explode, but if they're too close to the outlet values, then the residuals eventually converge, but my boundary conditions are basically ignored by Fluent when I look at the contours. For example, the pressure is way too high and the velocity is way too low. Is there any way to fix the boundary conditions so that they can't be changed when Fluent is running the calculations? This is so frustrating, and any help would be greatly appreciated.