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

Dynamic Viscosity at transportproperties dictionary

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 2, 2011, 15:06
Default Dynamic Viscosity at transportproperties dictionary
  #1
Member
 
Nickolas P
Join Date: Oct 2010
Location: Greece
Posts: 30
Rep Power: 15
NickolasPl is on a distinguished road
Hello Everyone,

I have a question concerning the transportproperties file.

I work with steady - state incompressible creeping laminar flows with very low Reynold number(Re=10^-1 ~ 10^-3) so I decided months ago to make the simulations using the simpleFoam solver, turning turbulence off so that to make the flow laminar. As I understand the viscosity of the material (say for a Newtonian one) is declared to the dictionary "transportproperties". There, is declared the dynamic viscosity "nu" for which nu=kinem.visc./density. If I have a material with kinematic viscosity say 5000 Pa.s and density=1000 (SI) then nu=50. But, for this value of 50 can be derived if I out viscosity 50000 and say density=10000 (little far-fetch though). So my question is, how do I know that these values belong to the ones I want? Of course this goes beyond, as the dynamic pressure is created and I want to calculate the pressure in SI units. Is the density declared somewhere else in the code?

Any comments or thoughts would be greatly appreciated.

Kindly,

Nickolas
NickolasPl is offline   Reply With Quote

Reply

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
Dynamic Viscosity of Acetylene or Critical Volume JohnGane1987 Main CFD Forum 0 March 30, 2010 07:01
User-defined turbulent viscosity - kinematic or dynamic? tstorm Main CFD Forum 4 January 29, 2010 12:08
User-defined turbulent viscosity - kinematic or dynamic? tstorm FLUENT 0 August 13, 2009 17:49
Problem with rhoSimpleFoam matteo_gautero OpenFOAM Running, Solving & CFD 0 February 28, 2008 07:51
How to calculate dynamic viscosity for sea water? James L. Main CFD Forum 5 October 7, 2003 19:05


All times are GMT -4. The time now is 01:10.