CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Floating point error - help

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

LinkBack Thread Tools Display Modes
Old   December 11, 2008, 14:16
Default Floating point error - help
Posts: n/a
Hi all,

I am using udf for Boundary conditions and also for calculating source terms. I compile my udf.

In the beginning of my simulations I get this floating piont error.

When I try to read few help mostly suggest to use coarse mesh or different initialisation. I have tried both but at some point of time it comes to same error.

One of my friend suggested me (1) define a regino for source. Can someone tell me how to do that.

(2) i am using C_VOF in my udf. There was also a chance of overflow of values. How to change it wen I am running my simulations. Any pointers and guidance will be veryhelpful.

Thanks. sk.
  Reply With Quote

Old   December 17, 2008, 11:31
Default Re: Floating point error - help
andrew clarke
Posts: n/a
Did you try using a double precision (dP) solving instead of normal solving as seen when you start up fluent? The error may be caused by loss of data (not enough decimel places in single precision solver) that could be reduced by using doubles as seen in the double precision solver.

Hope this helps in some way.

  Reply With Quote

Old   December 17, 2008, 11:32
Default Re: Floating point error - help
Posts: n/a
I am using double precision already .. Thanks for your suggestion.
  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
Floating point error prapanj OpenFOAM Running, Solving & CFD 1 March 12, 2009 08:57
Floating point error Chico Mbanu FLUENT 0 July 14, 2004 13:56
floating point error hussain FLUENT 2 June 15, 2004 03:12
floating point error Mavinakere FLUENT 3 March 1, 2002 18:22
floating point error sivakuamr Main CFD Forum 12 August 31, 2001 01:37

All times are GMT -4. The time now is 18:36.