|
[Sponsors] |
January 31, 2012, 11:43 |
Export & Import Velocity profile as Inlet
|
#1 |
Senior Member
Join Date: Dec 2010
Posts: 135
Rep Power: 15 |
Hi guys,
How can I import the velocity profile of a plane of one origin simulation as inlet of another simulation? I did the following way: -exported xyz table (velocity i,j,k Turbulence intensity, Turbulence rate,...) -imported the xyz table in the next simulation and set up the initial conditions for the inlet (turbulence profile, etc...) There is now a velocity profile imported - my problem is that the contour plot is different, and also e.g. the massflow averaged velocity magn. differs from the origin simulation. Am I doing something wrong? Thanks&Greets |
|
January 31, 2012, 18:50 |
|
#2 |
Member
Join Date: Feb 2011
Location: DE-PB
Posts: 56
Rep Power: 15 |
Is your mesh, where you like to map the data, identical to the mesh where you exported the data from? I mean especially the xyz-coordinates and also cell or face sizes.
|
|
February 1, 2012, 04:50 |
|
#3 |
Senior Member
Join Date: Dec 2010
Posts: 135
Rep Power: 15 |
The mesh is exactly in the same position, just the mesh size is at the 2nd simulation a bit lower. Is this the problem? I thought imported inlet conditions are more or less independent of the mesh in sense of start values....
|
|
February 1, 2012, 05:52 |
|
#4 |
Member
Join Date: Feb 2011
Location: DE-PB
Posts: 56
Rep Power: 15 |
Yes,this might be the cause for your differences. Cause each cell/face will get the table value for the shortest distance between cell/face center and the table coordinates.
By the way did you try to import your data as inlet conditions for a velocity inlet for example or as initial conditions for your continua or region? Cause it is not really clear to me for what you want to use the imported data. |
|
March 24, 2012, 07:26 |
|
#5 | |
Senior Member
Join Date: Jan 2012
Posts: 197
Rep Power: 14 |
Quote:
I am modeling a turbulent internal flow The velocity in the inlet boundary is dependent on time So I created a table including two columns: time and velocity by Excel And then I import it into star ccm What type of table should I choose? Table(time) or table(xyz,time)? Where should the table be set up? Initial condition or region? Many thanks |
||
March 26, 2012, 04:15 |
|
#6 |
Member
Join Date: Feb 2011
Location: DE-PB
Posts: 56
Rep Power: 15 |
It should be a table(time) with one column for time and one for velocity, if your inlet velocity should be the same for each cell at the velocity inlet. Otherwise you can create an table(x,y,z,time) so you can specify the inlet velocity regarding to your coordinate system.
At the velocity inlet you can set the inlet velocity under the physics value node to table(time) or table(x,y,z,time). If you have made the table by excel save it as .csv file and import it to ccm+. After you have imported the table in ccm+ you can rightclick on the table an select tabulate to check if your table is imported like you want it. |
|
March 26, 2012, 06:16 |
|
#7 | |
Senior Member
Join Date: Jan 2012
Posts: 197
Rep Power: 14 |
Quote:
However, where to put the table? both region or initial condition? or just one of them? When I set the table in the physical values, one option named data, I choose time or velocity? And in my table, the time increased by 0.0001s So the time step in star ccm should be 0.0001s as well? Once I complete running, how can I see results at different time? Sorry for my some stupid questions Many thanks |
||
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Fully developed 3d velocity profile: Square inlet! | Taru | FLUENT | 6 | September 14, 2015 09:38 |
velocity profile export from a simulation onto another | sudhirlv | STAR-CCM+ | 1 | September 12, 2010 19:57 |
How to create Hemisphere Velocity Profile at inlet | Nelson | FLUENT | 0 | July 10, 2005 22:44 |
using profile to specify inlet VOF and velocity | yf | FLUENT | 8 | June 2, 2005 06:40 |
Variables Definition in CFX Solver 5.6 | R P | CFX | 2 | October 26, 2004 03:13 |