[Roh]

Guys
I'm simulating an axisymetric nozzle and trying to measure its thrust. So tried to measure mass flow rate but it doesn't make any sense to me because suming the mass flow rate of Inlets and outlets are not in balance(its summing is not zero). Here is a screenshot of the mass flow rate.




As you can see Net Result is not zero. why?
I was thinking that maybe my problem is not converged completely. Here is a screenshot of the Residuals of this timestep:




Isn't this project converged?

[blackmask]

The major inlet flow is from one of the boundary named "outlet2". If this boundary is actually one of the outlet boundary type, you might consider changing it to one of the inlet boundaries, or you must set the reversing flow parameters carefully.

[Roh]

Originally Posted by blackmask

The major inlet flow is from one of the boundary named "outlet2". If this boundary is actually one of the outlet boundary type, you might consider changing it to one of the inlet boundaries, or you must set the reversing flow parameters carefully.

"outlet2" and "outlet1" are "Pressure farfield" and "outlet3" is "Pressure outlet". To prevent of revers flow I chose these boundries. Here is a screenshot of setting for "outlet1" and "outlet2"




And here is a screenshot of setting for "outlet3"




I chose this magnitude for Intensity and Viscosity ratio because the nozzle flow is injecting to the air and I don't expect any reverse flow. What do you think about this setting?