# Calculation of thrust and torque for propeller

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 April 27, 2017, 09:47 Calculation of thrust and torque for propeller #1 New Member   Join Date: Apr 2017 Posts: 2 Rep Power: 0 Dear all, I calculated the flow through an Propeller usining MRF and AMI-Patches. Now i want to compare my thrust and torque to experimental values. To do so I calculate both values in paraview. For thrust see Picture 1 and for torque Picture 2. Force.jpg torque.jpg If Integrate now both values (see Picture 3) my torque nearly exactly agrees with my experimental value (about 256000 Nm) while my thrust ist about 50% too small (410000 N). torque_force.jpg My Question now: Am I using the wrong value for the thurst and i have to calculate something additional with my Forces? Or what is the Explanation for the wrong thrust value and the correct torque value? I am thankful for every help. greetings hirota likes this.

 May 4, 2017, 11:17 #2 New Member   Martin Join Date: Oct 2013 Location: Newcastle Posts: 21 Rep Power: 10 Hello, I am currently trying to do something very similar here, have compared my thrust values to experiment and get a similar thrust coefficient following your method in Paraview. I am trying to get the same for torque, however i am not exactly sure how to compute that in paraview and unfortunately i cant read that line on the calculator shown in the screenshot. could you explain what exactly you specified there ? many thanks

October 28, 2019, 06:23
#3
Senior Member

Kmeti Rao
Join Date: May 2019
Posts: 145
Rep Power: 5
Hi Martin,

Quote:
 Originally Posted by mahtin360 Hello, I am currently trying to do something very similar here, have compared my thrust values to experiment and get a similar thrust coefficient following your method in Paraview. I am trying to get the same for torque, however i am not exactly sure how to compute that in paraview and unfortunately i cant read that line on the calculator shown in the screenshot. could you explain what exactly you specified there ? many thanks
Did you figure out how to find the moments using paraview? I have calculated the forces but unable to find the moments. It would be great if you can shed some light on this problem.

Thank you