help with fine/marine!

ellen lee · March 5, 2013, 10:08

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?

Rombzh · March 10, 2013, 09:45

You mean the predicted drag is off ? You might want to increase the y+ value, and already prescribe your final trim value in Hexpress.

ellen lee · March 12, 2013, 10:59

you mean fix the trim? but what if i don‘t know the final trim？

Rombzh · March 12, 2013, 12:05

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.

March 5, 2013, 10:08	help with fine/marine!	#1
ellen lee New Member Join Date: Mar 2012 Posts: 2 Rep Power: 0	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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March 10, 2013, 09:45		#2
Rombzh New Member Romain Join Date: May 2009 Posts: 21 Rep Power: 6	You mean the predicted drag is off ? You might want to increase the y+ value, and already prescribe your final trim value in Hexpress.

March 12, 2013, 10:59		#3
ellen lee New Member Join Date: Mar 2012 Posts: 2 Rep Power: 0	you mean fix the trim? but what if i don‘t know the final trim？

March 12, 2013, 12:05		#4
Rombzh New Member Romain Join Date: May 2009 Posts: 21 Rep Power: 6	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.