Hello,
In OpenFAST main file, I can change the ChkptTime argument to a different value, say: 10 to save checkpoints every 10 seconds.
I tried searching online, and also checked OpenFAST repository online, to find some examples on how to use these .chkp files to no avail.
When I run OpenFAST simulation it starts from time 0 and it doesn’t seems to use the checkpoint files by default.
How do I tell OpenFAST to use a specific checkpoint file to resume the simulations?
Best regards,
Dear @Yoor.Thiziri,
To restart OpenFAST from a checkpoint file, you should type:
<name of OpenFAST executable> -restart <root name of checkpoint file without extension>
For example:
C:\openfast_x64 -restart Test18.1800
which will start from Test.18.1800.chkp.
Best regards,
Many thanks for the answer.
Best regards,
Am I right that this is not available in FAST.Farm?
Dear @Reuben.Tinsdeall,
That’s correct. Checkpoint-restart capability has not yet been implemented in FAST.Farm. I realized this wasn’t listed as an issue in the OpenFAST GitHub repository, so, I just added it: Feature request: Complete Implementation of Checkpoint / Restart Capability in FAST.Farm · Issue #3048 · OpenFAST/openfast · GitHub.
Best regards,
Okay, thank you. Is there a workaround for putting two simulations back to back? I want to run some control simulations and it would save time if I only needed to run the initialisation period, for the wakes to develop, once. Can I save the wind field data and turbine positions at the end of one run and use them as initial conditions for a second run? Thanks a lot, Reuben
Dear @Reuben.Tinsdeall,
FAST.Farm does not currently offer a way to short-cut the start-up transient. You can certainly reuse precomputed ambiend wind data in multiple FAST.Farm simulations, but each time you run FAST.Farm, you must wait for the wakes to develop through the start-up transient.
Best regards,