CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > SU2 > SU2 Shape Design

Gradients for Thrust and Torque coefficients using Finite Differences

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 18, 2021, 12:35
Default Gradients for Thrust and Torque coefficients using Finite Differences
  #1
New Member
 
Join Date: Jun 2020
Posts: 25
Rep Power: 3
Daaman is on a distinguished road
Hi,

I want to verify the gradients of thrust and torque coefficients that I have obtained using discrete adjoint, against the finite differences. But, the gradients for thrust and torque are not mentioned in the list of gradients generated on implementing finite differences. In literature, I do see that it was one of the options for Finite Differences - http://adl.stanford.edu/papers/AIAA_...Rotor_2012.pdf. I'm using v 7.1.1. How can I generate the gradients for the thrust and torque coefficients using FD?

Thanks!
Daaman is offline   Reply With Quote

Old   July 19, 2021, 06:46
Default
  #2
New Member
 
Join Date: Jun 2020
Posts: 25
Rep Power: 3
Daaman is on a distinguished road
After comparing the gradients,

Ct (Thrust coefficient) = -CFz (Coefficient of Force-Z)
Cq (Torque coefficient) = -Cmz (Coefficient of Moment-Z)

After going through the literature, I think the above convention is used in the latest version, whereas in the older versions coefficient of Force-X was used for Thrust. But this could be case-dependent based on the axis of rotation.
Daaman is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
pimpleDyMFoam with sixDoFRigidBodyMotionCoeffs: External Torque chaz OpenFOAM Running, Solving & CFD 0 May 7, 2017 20:22
Rotor Torque Prediction jason OpenFOAM Running, Solving & CFD 7 August 16, 2016 10:34
Why air’s torque is negative and water’s torque is positive? Jackzm CFX 3 December 16, 2015 17:27
Torque Converter Pump Torque = Engine Torque? Torque_Converter Main CFD Forum 4 November 12, 2012 07:44


All times are GMT -4. The time now is 02:36.