DFBI, turbulence model and ship motion

January 19, 2009, 15:16

Goodevening

I've tried to run a simulation for ship motion (sink and trim). With the DFBI module, implicit unsteady, LAMINAR, I've got the ship motion attitude, but if I want to calculate Hydrodynamic forces I need a turbulence model. When I switch from LAMINAR to TURBULENCE (k-w SST or k-e), mesh with the correct boundary layer (y+=50),the simulation diverges and the free-surface at VOF=0,5 of water or air is very bad and unphysical.

Has anybody any idea to solve this question?? Why with lamiar model the simulation is ok and with turbulent one not??

I'm very interested in solving ship motion and hydrodynamics forces at the same time.

Thanks a lot. e.

hashem_1064 · June 4, 2010, 12:31

hi etteax
I v the same problem, may I have your ID to be in contact with you?
here is mine: hashem_1064@yahoo.com

January 19, 2009, 15:16	DFBI, turbulence model and ship motion	#1
ettax Guest Posts: n/a	Goodevening I've tried to run a simulation for ship motion (sink and trim). With the DFBI module, implicit unsteady, LAMINAR, I've got the ship motion attitude, but if I want to calculate Hydrodynamic forces I need a turbulence model. When I switch from LAMINAR to TURBULENCE (k-w SST or k-e), mesh with the correct boundary layer (y+=50),the simulation diverges and the free-surface at VOF=0,5 of water or air is very bad and unphysical. Has anybody any idea to solve this question?? Why with lamiar model the simulation is ok and with turbulent one not?? I'm very interested in solving ship motion and hydrodynamics forces at the same time. Thanks a lot. e.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Info on DFBI for Ship Motion	Simone	Siemens	17	March 29, 2016 21:19
turbulence model for ship hydrodynamics	ettax	Siemens	0	January 20, 2009 05:02
Simulation for ship rolling motion in Fluent?	VU THUAN	FLUENT	3	August 12, 2008 20:49
Ship motion	Yasser	CFX	1	June 5, 2007 15:59
Application of FEM for Ship Motion in Harbours	Suhas Thakurdesai	Main CFD Forum	0	October 31, 2003 03:31

June 4, 2010, 12:31		#2
hashem_1064 New Member hashem Join Date: May 2009 Posts: 17 Rep Power: 17	hi etteax I v the same problem, may I have your ID to be in contact with you? here is mine: hashem_1064@yahoo.com