CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FLUENT

What is the minimum value for URF?

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 23, 2017, 09:37
Default What is the minimum value for URF?
  #1
New Member
 
Prikane
Join Date: Mar 2016
Posts: 26
Rep Power: 3
Prikane is on a distinguished road
Dear colleagues,

I am working on problem in which I need to include dynamic mesh option. Pressure in this problem is really high (it goes above 1 GPa) and high pressure produces fluctuations in the UDF for dynamic mesh, more specifically in the main equation which calculates node positions at boundary. Pressure fluctuations are ripping my mesh apart and I have occurrence of negative cells. So in order to make numerical calculation more stable I need to apply URF for pressure.

My question is: What is the minimum value for URF? Does anyone know some recommendations from literature for the lowest URF?

At the moment, I am using value of 0.0001 as URF for pressure. With this value I do not have occurrence of negative cells but I am afraid it is too low and I will never get solution convergence.

Thanks in advance,

Prikane
Prikane is offline   Reply With Quote

Reply

Tags
fluent - udf, lowest urf, minimum urf, urf

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
Skewness , Minimum Edge Length and Mesh Quality in FLuent ViLaks FLUENT 2 March 2, 2017 06:57
Minimum PDF enthalpy exceeded during injection, without physical explanation Daveo643 FLUENT 1 November 2, 2015 12:47
Get the maximum and minimum pressure in the domain(In parallel calculation) xh110120 Fluent UDF and Scheme Programming 4 October 10, 2014 08:06
AMI: Minimum patch weight decreases with time lordvon OpenFOAM Running, Solving & CFD 2 September 3, 2013 12:39
Setting a minimum temperature value WillemvdM OpenFOAM Running, Solving & CFD 0 February 3, 2010 03:37


All times are GMT -4. The time now is 22:38.