Locating maximum lift forces on a ship hull

Liuks · September 28, 2021, 11:00

Hi everyone, I need a help with my CFD simulation of a ship hull. The ship hull is moving at a cruise speed of 15km/h and its draught is 5 m. I need to determine the maximum lift force and its position but I don't know how to do it. In particoular I can't find the position of maximum lift force.
Thanks for the attention,
regards

fluid23 · October 7, 2021, 09:47

Perhaps you need to rephrase your question? What do you mean by maximum lift and it's position? Generally speaking, forces are an integration of pressure and shear stresses on the body. These produce a moment about your center of gravity and by taking the moment and forces that result from this integration, you can back out the distance from the CG to the location where an equivalent point load exists. I think the phrase 'maximum lift' would only be pertinent to a series of discrete lift calculations (i.e. unsteady analysis).

Moment = Force x Distance

September 28, 2021, 11:00	Locating maximum lift forces on a ship hull	#1
Liuks New Member Roma Join Date: Sep 2021 Posts: 1 Rep Power: 0	Hi everyone, I need a help with my CFD simulation of a ship hull. The ship hull is moving at a cruise speed of 15km/h and its draught is 5 m. I need to determine the maximum lift force and its position but I don't know how to do it. In particoular I can't find the position of maximum lift force. Thanks for the attention, regards Peresvet likes this.

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October 7, 2021, 09:47		#2
fluid23 Senior Member Matt Join Date: Aug 2014 Posts: 947 Rep Power: 18	Perhaps you need to rephrase your question? What do you mean by maximum lift and it's position? Generally speaking, forces are an integration of pressure and shear stresses on the body. These produce a moment about your center of gravity and by taking the moment and forces that result from this integration, you can back out the distance from the CG to the location where an equivalent point load exists. I think the phrase 'maximum lift' would only be pertinent to a series of discrete lift calculations (i.e. unsteady analysis). Moment = Force x Distance