[Roh]

Guys,
Monthes ago, created this topic:


Why I cannot calculate the thrust of my nozzle?


But can I use CFD-Post to calculate the thrust?


Take a look at this screenshot:






I think we can use the calculator of CFD-post. look at the setted options. Using function "Force" we can calculate the force (Pressure + Momentum) on each boundry(for me I have four boundries named as inlet,outlet1,outlet2 and outlet3) and then we can plus all of the forces to obtain the thrust force of the nozzle. Am I right? Are all of my discriptions correct?


Here is a link to discription of Function Calculator:


https://www.sharcnet.ca/Software/Ans.../NHFIFMEM.html


And here you can see:

The magnitude of the force vector on a boundary.
Supports “[<Phase>.]” and “@<Location>”.
See force.

And finally more details on force:


https://www.sharcnet.ca/Software/Ans.../i1308522.html

[AtoHM]

I looked at the calculation in the other thread you linked. The approach to sum the momentum over your domain makes sense, however, it seems you completely neglected the pressure present at the solid walls.

Using the CFD results it should not be too hard to get your desired value.