Force Vector

ahmedtariq90 · December 20, 2017, 12:06

Can any one please help me about the Force Vector we select in calculation of Cd and Cl.

vitome · December 20, 2017, 17:41

I don't know if you're asking the the axis you need to select, but if it is... You've to select -y for the Cd and +x for the Lift. Sorry if you're asking something different but I didn't understand clearly

flotus1 · December 20, 2017, 17:52

I agree with -y being the only sensible option for drag. Lift depends on what the "up" direction actually is in this setup. Impossible to judge from the picture and description.

ahmedtariq90 · December 21, 2017, 00:37

I want actually to know what Force vector i should mention in calculation of Drag. In some tutorials the guy put X1 Y1 and Z1, in my case i agree with -y, but what does this mean by putting X1 and Z1. ? Help plz

flotus1 · December 21, 2017, 05:20

What are the x, y and z components of a unit vector in -y direction in a Cartesian coordinate system? Think about it, that will answer your question.

December 20, 2017, 17:41		#2
vitome New Member vito Join Date: Dec 2017 Posts: 5 Rep Power: 8	I don't know if you're asking the the axis you need to select, but if it is... You've to select -y for the Cd and +x for the Lift. Sorry if you're asking something different but I didn't understand clearly ahmedtariq90 likes this.

December 20, 2017, 17:52		#3
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,427 Rep Power: 49	I agree with -y being the only sensible option for drag. Lift depends on what the "up" direction actually is in this setup. Impossible to judge from the picture and description. ahmedtariq90 likes this.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
how to set periodic boundary conditions	Ganesh	FLUENT	15	November 18, 2020 07:09
The fl process could not be started.	SHAFKAT91	Fluent UDF and Scheme Programming	14	September 2, 2019 04:48
ActuatorDiskExplicitForce in OF2.1. Help	be_inspired	OpenFOAM Programming & Development	10	September 14, 2018 12:12
Force can not converge	colopolo	CFX	13	October 4, 2011 23:03
how does Fluent calculate the pressure and viscous force vector?	Ralf Schmidt	FLUENT	2	May 17, 2010 16:49

December 21, 2017, 00:37		#4
ahmedtariq90 New Member Ahmed Join Date: Dec 2016 Posts: 10 Rep Power: 9	I want actually to know what Force vector i should mention in calculation of Drag. In some tutorials the guy put X1 Y1 and Z1, in my case i agree with -y, but what does this mean by putting X1 and Z1. ? Help plz

December 21, 2017, 05:20		#5
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,427 Rep Power: 49	What are the x, y and z components of a unit vector in -y direction in a Cartesian coordinate system? Think about it, that will answer your question.