CFD Online Logo CFD Online URL
Home > Forums > General Forums > Main CFD Forum

Grid Independent Study for a car

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

LinkBack Thread Tools Search this Thread Display Modes
Old   January 26, 2011, 14:31
Default Grid Independent Study for a car
Join Date: Jan 2011
Posts: 69
Rep Power: 15
John222 is on a distinguished road

I have a car and I need to perform grid independent study on the car, I have made the default mesh and it was OK however I need the grid independent study for better meshing.

Does anyone have a good website I can learn how to create grid independent study?

Thanks a lot, J
John222 is offline   Reply With Quote

Old   January 26, 2011, 19:05
Senior Member
Julien de Charentenay
Join Date: Jun 2009
Location: Australia
Posts: 231
Rep Power: 18
julien.decharentenay is on a distinguished road
Send a message via Skype™ to julien.decharentenay
Hi J,

A grid independent study (which should be called grid dependence study) looks at how the solution evolves with the grid resolution. Here is how you can undertake such study:

1) Build a reference grid G;
2) Run the simulation on the reference grid (to a defined convergence level);
3) Extract relevant information (drag?);
4) Build a refined grid G-R1 (if you do it by the book it is refined by 2 in all directions);
5) Run simulation
6) Extract relevant information;
7) Build a refined grid G-R2 (refined compared to G-R1) and redo 5 and 6 on R2
8) Plot the relevant information as a function of G, G-R1 and G-R2.

The solution is grid independent if the information does not change with G, G-R1 and G-R2 (meaning that your grid R is "fine enough" to capture the physics/numerics/etc).

Hope this help.
Julien de Charentenay
julien.decharentenay is offline   Reply With Quote


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
how to do a grid independent study xyq102296 ANSYS 16 November 11, 2021 08:05
What is meant by Grid Independence Study? Khan FLUENT 10 July 2, 2015 22:40
Combustion Convergence problems Art Stretton Phoenics 5 April 2, 2002 05:59
Grid Independent Solution Hesham M. Aly FLUENT 2 October 5, 2000 08:24

All times are GMT -4. The time now is 21:30.