CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Direction vectors in Porous Medium

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

LinkBack Thread Tools Display Modes
Old   January 7, 2015, 09:59
Default Direction vectors in Porous Medium
New Member
Join Date: Jul 2014
Posts: 9
Rep Power: 5
RajG is on a distinguished road
hello everyone,
I am doing cfd analysis of simple rectangular duct with oil as fluid.Wavy type turbulators are inside the duct.I am using Porous model for pressure drop analysis(in Fluent 14.5) due to complex geometry of turbulator.

I am confusing about Direction -1 vector/Direction -2 vector/Direction 1,Direction 2 ,Direction 3.

I dont know how to enter resistance in direction Z considering flow direction for my geometry.I am attaching image file with this.

I am waiting for your reply guys.
Thank you so so much in advance.
Attached Images
File Type: jpg Direction Vector.jpg (47.9 KB, 28 views)
RajG is offline   Reply With Quote

Old   January 8, 2015, 03:44
Senior Member
François Grégoire
Join Date: Jan 2010
Location: Laval University, Canada
Posts: 389
Rep Power: 10
macfly is on a distinguished road

Since the duct seems to be aligned with the coordinate axes (x, y, z), leave the default values
Direction-1 Vector => X=1, Y=0, Z=0
Direction-2 Vector => X=0, Y=1, Z=0

Regarding the resistance, it depends on the properties of the porous material. If the material is isotropic, enter the same values for all directions.
macfly is offline   Reply With Quote

Old   February 22, 2016, 14:10
Join Date: Feb 2012
Location: Canada
Posts: 93
Rep Power: 7
enayath is on a distinguished road

I have a question regards to the Direction-1 vector in a 2D axi-symmetric model in Fluent for a porous zone. I want to have viscous and inertial resistance in both x and y (basically axial and radial direction)...Do I need to set x=1 ,y=0 or x=1, y=1 in Direction-1 vector section?

I think it should be x=1, y=0 for Direction-1 vector and fluent automatically consider x=0,y=1 for Direction-2 vector which is not shown explicitly.
Thank you,
enayath is offline   Reply With Quote


Thread Tools
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 On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Flow through porous medium using CFX: lack of convergence Chander CFX 3 July 23, 2014 06:32
how to define the porous direction vectors like this hitchenxue FLUENT 2 April 30, 2014 00:10
Direction vectors and adsorption in porous zones Toplaa FLUENT 0 August 16, 2013 14:22
Velocity inlet boundary condition for porous medium Chander CFX 3 March 11, 2012 22:18
porous medium and reactions Valeria FLUENT 1 July 10, 2009 03:58

All times are GMT -4. The time now is 19:10.