CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > CFX

help in external aerodynamics

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

LinkBack Thread Tools Search this Thread Display Modes
Old   August 21, 2012, 11:49
Default help in external aerodynamics
New Member
jayanth joseph
Join Date: Aug 2012
Posts: 3
Rep Power: 13
jayanth1990 is on a distinguished road
hello people im new here and i just finished a basic cfx course but still im not well versed in it
i learned cfx because it will be useful for my project work in external vehicle aerodynamics

i ran into several problems while im trying to solve the model

1) in the place i learnt they thought me they tld me u have to subtract the solid model from the external domain in case of external aerodynamics then mesh it
but when i try to do subract in boolean operation ( in ansys modeller) it gives me errors when i try the body operation all the surfaces are not deleted

2)it is seen that if ur going to analyse a car at particular wind speed u need certain domain measurements were can i get those formulas ?

3)how am i going to calculate the frontal are of the car which is needed for the drag calculations
jayanth1990 is offline   Reply With Quote

Old   August 21, 2012, 14:34
Senior Member
Edmund Singer P.E.
Join Date: Aug 2010
Location: Minneapolis, MN
Posts: 511
Rep Power: 20
singer1812 is on a distinguished road
From your post, it seems like you are new to CAD and CFD. Try some simple things first.

1) Use a cube shape or sphere shape instead of your vehicle shape. Try subtracting that from the air domain. This will let you see how it works. You might have poor vehicle geometry which prohibites the operation.

2) Once again, use a cube or sphere first. Look up in any elementary text book. The equations for measurement are in there. Do something simple. Using a cube or sphere also allows you to quickly compare results to textbook examples.

3) Use a projected frontal area. CAD system will tell you this. Depeneds on what you are working in.
singer1812 is offline   Reply With Quote


aerodynamics, domain extents, drag coefficient, modeling cfd

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
CGNS Compiling Diego Main CFD Forum 17 December 21, 2014 01:40
DOCUMENT EXTERNAL AERODYNAMICS Erdem Siemens 4 October 12, 2010 09:23
DOCUMENT EXTERNAL AERODYNAMICS Erdem Main CFD Forum 0 March 4, 2006 17:48

All times are GMT -4. The time now is 05:32.