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

SSIIM 2, vertical elevation of the water surface, transient water flow parameters

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

Like Tree1Likes
  • 1 Post By qinjie1629

Reply
 
LinkBack Thread Tools Display Modes
Old   September 19, 2012, 09:22
Default SSIIM 2, vertical elevation of the water surface, transient water flow parameters
  #1
New Member
 
Miss Mummputz
Join Date: Sep 2012
Posts: 7
Rep Power: 4
Mummputz is on a distinguished road
I want to simulate a step- pool ramp with ssiim2. However, the measured vertical elevations of the water surface don't match with the simulated ones- while the measured heights increase lightly where the stone bars are, there is no influence at all of the stone bars on the water heights in the simulation and the water surface is totally smooth. I increased the stone bars and their roughness, but this doens't help.

This is why I wanted to introduce transient water flow parameters by using the F 33 data set and a gravity- algorithm by using the F36 15 data set. However- this doesn't work and the solution never converges!!! I'm very much beginner with all of that and it would be very useful to have an example where these data sets do work. On the norvegian ssiim- homepage, there is such an example, but it doesn't work with the currently downloadable ssiim2-version. If anybody could provide me an example- I would be so glad- thank you!!
Mummputz is offline   Reply With Quote

Old   October 22, 2012, 00:35
Default
  #2
New Member
 
Jie Qin
Join Date: Mar 2011
Posts: 8
Rep Power: 6
qinjie1629 is on a distinguished road
Maybe you can post your control and unstruc file, I can run it to find out what is the problem.
Mummputz likes this.
qinjie1629 is offline   Reply With Quote

Old   October 23, 2012, 08:09
Default control and unstruc file
  #3
New Member
 
Miss Mummputz
Join Date: Sep 2012
Posts: 7
Rep Power: 4
Mummputz is on a distinguished road
thank u, so nice!!- attached the control and unstruc files
all the best!
Attached Files
File Type: zip unstruc_and_control.zip (50.7 KB, 20 views)
Mummputz is offline   Reply With Quote

Old   October 23, 2012, 11:39
Default
  #4
New Member
 
Jie Qin
Join Date: Mar 2011
Posts: 8
Rep Power: 6
qinjie1629 is on a distinguished road
I think the most possible reason is attributed to the mesh quality. When you open the SSIIM2, choose 'View' ->'Profile I', you can find that the mesh is too thick in vertical direction and too sparse in longtitudinal direction. Generally, individual grids should close to 'square' not 'rectangular' shown in your mesh. You can try to rebuilt the mesh and run it again.
qinjie1629 is offline   Reply With Quote

Old   October 24, 2012, 02:54
Default
  #5
New Member
 
Miss Mummputz
Join Date: Sep 2012
Posts: 7
Rep Power: 4
Mummputz is on a distinguished road
I've already tried that before- it didn't work, that's why I tried to create a mesh as simple as possible

I can't attach the unstruc file, bcse it's too big, that's why I send u the control and koordina file
Attached Files
File Type: zip control.zip (360 Bytes, 16 views)
File Type: zip koordina.zip (22.3 KB, 12 views)
Mummputz is offline   Reply With Quote

Old   October 24, 2012, 09:05
Default
  #6
New Member
 
Jie Qin
Join Date: Mar 2011
Posts: 8
Rep Power: 6
qinjie1629 is on a distinguished road
I tried to run the case you post for the first time by simply modifying several parameters and the resutl is attached. The deformation of water surface around the triangle can be observed. The flow discharge is 4. You can change the discharge from 1 to 5 to see the variation of flow surface. I am not sure whether this is what your expected result.

I found the Koordina file doese not like a really topography of step-pool, so did the fisrt unstruc file. So, how did you specified the flow discharge and flow depth in the control file. Different flow discharge and flow depth will affect the flow depth near the obstacle significantly.
Attached Images
File Type: jpg 1.jpg (10.9 KB, 17 views)
qinjie1629 is offline   Reply With Quote

Old   November 18, 2012, 14:39
Default geodata
  #7
New Member
 
mona
Join Date: Nov 2012
Posts: 2
Rep Power: 0
mona nemati is on a distinguished road
i have many problem with geodata file in ssiim2,when i involve a geodata file in path ssiim2,for see the points cliking "view> GridEditor> Geodata point"
but any point i can't see,until click the legend,then i see cell number in ssiim,but i dont know how make grid with geodatapoint,is there anyone help me here?
mona nemati is offline   Reply With Quote

Reply

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
Gravity Flow Velocity Computation Jerry McHugh Main CFD Forum 1 March 16, 2007 14:24
Terrible Mistake In Fluid Dynamics History Abhi Main CFD Forum 12 July 8, 2002 09:11
uptodate water distribution network fredius,magige,tanzanian,(e.a) Main CFD Forum 0 January 27, 2002 08:10
gravitational force for free surface flow Jongtae Kim Main CFD Forum 1 July 2, 2000 11:57
fluid flow fundas ram Main CFD Forum 5 June 17, 2000 21:31


All times are GMT -4. The time now is 09:00.