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-   -   Initializing simulation from previous results help (http://www.cfd-online.com/Forums/fluent/75475-initializing-simulation-previous-results-help.html)

siw April 27, 2010 06:21

Initializing simulation from previous results help
 
Hi,

The other day I ran a simulation with the first-order accurate method. Now I'd like to use those results (it's on the same mesh with the same boundary conditions) to initialize a run with a high-order accurate method.

I've checked the User Guide but I cannot see how to initialize a run with another saved simulation result file.

Can anyone tell me how?

Thanks

leonardo.morita April 27, 2010 07:57

If you use the same mesh, you can open the same .dat file and "continue" your simulation with new set up.
If this doesn't work for any reason, you can open your first case, write an .ip file (File > Interpolate > Write data) and then read it for the new one (File > Interpolate > Read).

siw April 27, 2010 08:17

Thank you.

Saima June 13, 2011 13:05

I am working on CFX and my mesh every time change a bit and i want to use previous result file.

Could you pls help me out...how can i do this?

Best Regards,
Quote:

Originally Posted by siw (Post 256456)
Thank you.


pranab_jha June 13, 2011 18:19

You should use a .ip file as suggested by Leonardo. It does not matter if your mesh resolution changes a bit, this interpolation file will interpolate the values at your current nodes. I also had similar issue and I finally resolved it.

http://www.cfd-online.com/Forums/flu...ther-case.html

Saima June 13, 2011 19:27

Thank you very much for your reply.

I have one more query.
I want to stope solver by the efficiency smoothness. That means I want to see efficiency curve if its not changes than want to stope my solver.

I found in CFX solver control there is an option interrupt control and i can define efficiency expression. But How can i cake difference of two iteration (smoothness)?

Hope you understand my question.

Regards,

pranab_jha June 13, 2011 19:31

Can't help you on this one... I use Fluent 6.3 (as my university has it). Is efficiency smoothness related to the residuals by any chance?

Saima June 13, 2011 19:34

No smoothness is different from residual RMS is root mean square error. which is based on average value.

Anyways thank you very much for the first part.

Pastelucho March 22, 2013 16:46

Quote:

Originally Posted by leonardo.morita (Post 256450)
If you use the same mesh, you can open the same .dat file and "continue" your simulation with new set up.
If this doesn't work for any reason, you can open your first case, write an .ip file (File > Interpolate > Write data) and then read it for the new one (File > Interpolate > Read).

When using the dat file from a previous simulation to do a new one with different set up, do I have to initialize solution or directly run the calculation?.

mahditorabiasr December 28, 2013 12:08

Use Solution Data from File as Initialization Method
 
Quote:

Originally Posted by siw (Post 256437)
Hi,

The other day I ran a simulation with the first-order accurate method. Now I'd like to use those results (it's on the same mesh with the same boundary conditions) to initialize a run with a high-order accurate method.

I've checked the User Guide but I cannot see how to initialize a run with another saved simulation result file.

Can anyone tell me how?

Thanks


Go to "Calculation Activities" menu
Tick the "Automatically Initialize Solution and Modify Case" option
Click "Edit"
Go to "Initialization Method" tab
Choose "Use Solution Data from File" option
Locate the existing result file with ".dat.gz" extension
Ok and then run calculation as usual.



Ahmed Saeed Mansour July 12, 2016 15:45

When I follow your steps, the solution begins and then stops after 30 iterations...what should I do? the number of time steps is changed to automatic and I wanna 10000
Thanks


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