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

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).

Thank you.

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,

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

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,

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?

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.

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?.

Use Solution Data from File as Initialization Method
 

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.

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

Hi Ahmed Saeed Mansour,
Have you solved this problem? I am also facing the same problem. my unsteady solution stopped because of less memory space. now how can i start simulation from previous time step data? i have previous time steps case and data files and tried with method suggested by mahditorabiasr but it stop after few iteration.
i will appreciate if you can help.

Thanks
Saurabh

Hello dear Rsaurabh, Open Fluent from its single Icon without opening Ansys workbench...Then click on File ..read...Select the last case and data file .cas like the attached snapshot...then the program has to read the solution at this time step..I have made this many times..Thanks

Thanks Ahmed Saeed Mansour. i was doing it with mahditorabiasr suggestion that was not working but just simply load case and data works.

Thanks again
Saurabh

Not at all sir :)

Thank you!

You are welcome dear Lape!! :)