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May 20, 2014, 03:40 |
Continue a finished calculation
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#1 |
Member
Join Date: Apr 2014
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Posts: 47
Rep Power: 12 |
Hey guys,
i have a question according Fluent. I already finished some transient simulations with 5000 time-steps. Now i want to use their results but change some settings. Lets say i want to start at time step 2500 of the old simulations, change settings an calculate from this point. When i try to do this my flow time jumps back to 0....is there anyway to solve this problem? Thanks a lot! |
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May 20, 2014, 04:09 |
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#2 |
Senior Member
Flavio
Join Date: Sep 2011
Location: Brescia, Italy
Posts: 181
Rep Power: 15 |
Hi FluentStarter,
unfortunately there isn't possibility to restart the simulation from a previous time-step: if you want to fix a reference time you have to save your case at this step (so, for example, you have to save your data after 2500 time-step). If you have a case saved you can start from its results! Regards
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Bionico |
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May 20, 2014, 04:25 |
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#3 |
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Join Date: Apr 2014
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Hi Bionico,
thanks for your rapid reply. Maybe I explain my case: I simulate a cylinder filled with gas. Then this gas is compressed by a piston. At step 2500 the piston reaches the BDC. I already simulate this case till the step 2500,changed my dynamic mesh options so that the piston doesnt move any more and simulated 2500 more steps. This worked well! Now i want to use the first 2500 steps, simulate 100steps more to drive the piston a bit back and then stop his motion for about 2400 steps. I have have autosaved .dat and .cas files everey 50 timesteps. I tried it with import fluentcase and it opens the case at step 2500. But when i want to start it again, i have to problems: 1. I have to initialize the solution: How do i do this? I cant use the same values that i used before step 0. 2. When I try it like this my flow time is resetted.... Thankyou =) |
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May 20, 2014, 05:50 |
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#4 |
Senior Member
Flavio
Join Date: Sep 2011
Location: Brescia, Italy
Posts: 181
Rep Power: 15 |
It's very strange: are you sure that the .DAT file is loaded correctly?
Regards
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Bionico |
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May 20, 2014, 06:02 |
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#5 |
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I donīt load the .dat-file. I load the .cas.gz-file via import case-file
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May 20, 2014, 06:04 |
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#6 |
Senior Member
Flavio
Join Date: Sep 2011
Location: Brescia, Italy
Posts: 181
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You have to import even .DAT file in order to start the simulation from the point it finished!
Regards
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Bionico |
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May 20, 2014, 06:08 |
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#7 |
Member
Join Date: Apr 2014
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Okay...its really strange. I work with Ansys Workbench and when i click on import case-file directly in the project it does not work.
Now i started Fluent without loading any data and clicked in import data there....time flow is fine now...i`ll calculate some steps and see what happens to pressure and temperature! Thanks anyway Bionico |
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May 20, 2014, 07:57 |
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#8 |
Senior Member
Flavio
Join Date: Sep 2011
Location: Brescia, Italy
Posts: 181
Rep Power: 15 |
Usually I work on Fluent separately from Workbench: I suggest reading ANSYS Manuals, anyway probably you have to connect Results in the workflow.
Best Regards
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Bionico |
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