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Mr. Persson Adam

Running hull study with offsets as input?

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Hello,

 

I have a series of parametrically varied hull designs already generated, and exported as SHIPFLOW offsets. Now, how can I conduct an evaluation of these without running each design manually? It is worth mentioning that I also want to run each hull for a variety of speeds.

 

Is there some way to conduct for example an Ensemble Investigation and simply change the offset file sent to SHIPFLOW, and then run each hull at a number of speeds?

 

Or, as an alternative solution, just run a series of SHIPFLOW configurations in batch?

 

Of course, I could model the hull fully parametrized in CAESES, but that would be a lot of extra work, since the hull series s already generated!

 

Thank You,

Adam Persson

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Hello Claus,

 

The hulls are created in an external software and then imported as offsets into FFW/SHIPFLOW. I am considering remodelling them parametrically in FFW, but if I can avoid that extra work it would be great, since I already have a complete collection of hulls as offsets!

 

Best regards,

Adam

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Hi Adam,

 

please see my attached project for my approach to this problem. It should be pretty easy to understand. Note that the Shipflow setup is (of course) not really set up.

 

Points to look at:

  • The StringParameters in the "hulls" scope should contain the file names to your offset files and should be grouped in the entitygroup "allHulls"
  • The offset entry of the shipflow configuration accesses that entitygroup to get the offset file name
  • the vship entry is varied through the dv_config_speed variable
  • The ensemble investigation varies the hullIndex (you need to adjust the series to match the number of offset files) so the different offset files are used
  • For each of those hulls the speed variable is varied

I did not test the setup, but I am pretty confident that it should work.

 

Remember to set the number of parallel instances for the Shipflow computation to match your available resources (licenses and CPU power). If you only want one Shipflow computation to run at a time, I suggest to disable the "asynchronous update" option of the computation.

 

Hope this helps,

Arne

forum334.fdb

Edited by Mr. Arne Bergmann
Forgot the attachment

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