separate positive and negative forces on surface

xava · December 5, 2017, 10:15

Dear members,

My model consist of a simple rectangular vehicle, which is simulated using Ansys Fluent. The data can be exported to Paraview of CFD Post. I would like to obtain the positive and negative pressure forces (so suction force and pressure force) in x, y and z direction. Thusfar, I only obtained the total pressure force, per surface for the 3 directions, though I would like to separate this into the positive and negative values. Any suggestions how to do this?

All help is appriciated

TheVictorVS · December 5, 2017, 11:14

You could include some images of the model in question to illustrate the subject, it seems to me that what you need to visulate the pressure lines is just that, a map dento of the whole study volume of your model, I suppose that when modeling the car you included the domain around the car to model the aerodynamic resistance of the vehicle in motion, until someone more specialized in that software answer you can try to find some tutorial material on how to add these representations to the postoprocessing section of your model.

Ravindra Shende · December 5, 2017, 11:30

There is no ready-made filter in Paraview to do that, so you will have to write your own script to do that.
Its same as creating your own custom filter.

FMDenaro · December 5, 2017, 11:32

Use the definition of the integral over the body and then project along the normal and tangential directions https://www.grc.nasa.gov/www/k-12/airplane/presar.html

December 5, 2017, 10:15	separate positive and negative forces on surface	#1
xava New Member Xavation Join Date: Dec 2016 Posts: 9 Rep Power: 9	Dear members, My model consist of a simple rectangular vehicle, which is simulated using Ansys Fluent. The data can be exported to Paraview of CFD Post. I would like to obtain the positive and negative pressure forces (so suction force and pressure force) in x, y and z direction. Thusfar, I only obtained the total pressure force, per surface for the 3 directions, though I would like to separate this into the positive and negative values. Any suggestions how to do this? All help is appriciated

December 5, 2017, 11:14	hello	#2
TheVictorVS New Member Victor Casquero Join Date: Dec 2017 Posts: 14 Rep Power: 8	You could include some images of the model in question to illustrate the subject, it seems to me that what you need to visulate the pressure lines is just that, a map dento of the whole study volume of your model, I suppose that when modeling the car you included the domain around the car to model the aerodynamic resistance of the vehicle in motion, until someone more specialized in that software answer you can try to find some tutorial material on how to add these representations to the postoprocessing section of your model.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Positive or negative values of Lambda2 for vortex structure visualization?	vidyadhar	OpenFOAM Running, Solving & CFD	3	November 27, 2019 08:03
Negative drag forces of fanwing airfoil	vkid185	OpenFOAM Post-Processing	0	March 26, 2017 07:16
Positive Pressure ang negative Pressure	moca	CFX	3	September 18, 2010 06:00
body has to move in positive and negative x-direction (UDF?)	bobo	FLUENT	0	July 2, 2009 06:41
positive and negative torque forces	Wei-Haur Lam	CFX	0	March 19, 2008 07:45

December 5, 2017, 11:30		#3
Ravindra Shende Member Ravindra Shende Join Date: Feb 2011 Location: Pune, India Posts: 45 Rep Power: 15	There is no ready-made filter in Paraview to do that, so you will have to write your own script to do that. Its same as creating your own custom filter.

December 5, 2017, 11:32		#4
FMDenaro Senior Member Filippo Maria Denaro Join Date: Jul 2010 Posts: 6,768 Rep Power: 71	Use the definition of the integral over the body and then project along the normal and tangential directions https://www.grc.nasa.gov/www/k-12/airplane/presar.html