CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Bug: Surface Integral->Sum w/cut plane and x-face-area

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

LinkBack Thread Tools Display Modes
Old   June 9, 2009, 13:11
Default Bug: Surface Integral->Sum w/cut plane and x-face-area
New Member
Andrew Godfrey
Join Date: Mar 2009
Posts: 7
Rep Power: 10
agodfrey is on a distinguished road


A custom field function: d-area = abs(x_face_area)
Reports: Surface Integrals
Report Type: Sum
Field Variable: Custom field functions
darea (defined as abs(x-face-area) )
Surfaces: A defined constant-x plane cut through the domain

Yields: Zero erroneously

Other information:

Writing the data shows that each face equals zero to machine precision.

Report Type: Area yields the correct (non-zero) area.

Report Type: Integral w/Custom Fields Function unity (defined as 1) also yields the correct area.

Report Type: Sum on a boundary surface yields the correct area.

Conclusion: Using Sum with a custom field function which needs x-area-face on a defined surface yields erroneous results. Use Report Type: Integral instead.

Note: the integrand of interest is actually (rho * Vx ^ 2 * d-area)
agodfrey 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
Problem with Gmsh nishant_hull Open Source Meshers: Gmsh, Netgen, CGNS, ... 23 August 5, 2015 02:09
ATTENTION! Reliability problems in CFX 5.7 Joseph CFX 14 April 20, 2010 15:45
Surface Integral - Mass Flow Rate Venkatesh V FLUENT 3 October 10, 2008 16:18
Making boundary profile on a surface in xz- plane varghese FLUENT 6 May 3, 2002 08:38

All times are GMT -4. The time now is 03:51.