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help with fine/marine!

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Old   March 5, 2013, 11:08
Default help with fine/marine!
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ellen lee is on a distinguished road
I am using fine/marine with a planing hull, and the results are not very accurate,I am wondering is it because the froud number is over 3 or still problems with the meshing?
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Old   March 10, 2013, 09:45
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You mean the predicted drag is off ? You might want to increase the y+ value, and already prescribe your final trim value in Hexpress.
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Old   March 12, 2013, 10:59
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you mean fix the trim? but what if i don‘t know the final trim?
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Old   March 12, 2013, 12:05
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Well you could use the trim value you got with your first run, even if forces were off, rotate your geometry in Hexpress and build the mesh.
You can also predict your final trim value with Savitsky's formulae.
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Old   June 16, 2013, 11:36
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have you make sure there is no air entrapment below?
This I found to reduce the viscous drag significantly.
Check your mesh resolution on the transom as well, it needs to be fine enough so that the water separate from the hull nicely.
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