axis of rotation for gen6DoF option

hydraulist · November 30, 2015, 08:27

Hi,

I apologize for another separate post on gen6DoF, since i couldn't get any replies i've made this thread.
Could anyone tell me about the default axis of rotational oscillation in gen6DoF application? Is it the CofG (Center of gravity) or the axis can be some arbitrary point outside the body. I'm working on liquid sloshing in a tank and interested to give rotation of tank about some arbitrary point. What could be done if i want to change the axis of rotation of a tank? Thanking you

wouter · November 30, 2015, 17:45

Hello hydraulist,
I think the answer is in
...../OpenFOAM/OpenFOAM-3.0.x/src/sixDoFRigidBodyMotion/sixDoFRigidBodyMotion
where it says that the momentum is calculated based on the axis

Code:

           // Moments are returned in global axes, transforming to
            // body local to add to torque.
            tau() += Q().T() & (rM + ((rP - centreOfRotation()) ^ rF));

hope this helps,
Wouter

hydraulist · December 5, 2015, 01:36

Hello Wouter,
Thank you for the reply. I'l try to understand and use that.

November 30, 2015, 08:27	axis of rotation for gen6DoF option	#1
hydraulist New Member Join Date: Jul 2015 Posts: 12 Rep Power: 10	Hi, I apologize for another separate post on gen6DoF, since i couldn't get any replies i've made this thread. Could anyone tell me about the default axis of rotational oscillation in gen6DoF application? Is it the CofG (Center of gravity) or the axis can be some arbitrary point outside the body. I'm working on liquid sloshing in a tank and interested to give rotation of tank about some arbitrary point. What could be done if i want to change the axis of rotation of a tank? Thanking you

November 30, 2015, 17:45		#2
wouter Senior Member Wouter van der Meer Join Date: May 2009 Location: Elahuizen, Netherlands Posts: 203 Rep Power: 17	Hello hydraulist, I think the answer is in ...../OpenFOAM/OpenFOAM-3.0.x/src/sixDoFRigidBodyMotion/sixDoFRigidBodyMotion where it says that the momentum is calculated based on the axis Code: // Moments are returned in global axes, transforming to // body local to add to torque. tau() += Q().T() & (rM + ((rP - centreOfRotation()) ^ rF)); hope this helps, Wouter

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
Error message: Insufficient Catalogue Size	Paresh Jain	CFX	32	February 3, 2021 03:37
Wind turbine simulation	Saturn	CFX	58	July 3, 2020 01:13
Simulation of a single bubble with a VOF-method	Suzzn	CFX	21	January 29, 2018 00:58
Error in Two phase (condensation) modeling	adilsyyed	CFX	15	June 24, 2015 19:42
ansys cfx solver exit with return code 1!!!!!	mhabibnia	CFX	7	August 19, 2013 03:53

December 5, 2015, 01:36		#3
hydraulist New Member Join Date: Jul 2015 Posts: 12 Rep Power: 10	Hello Wouter, Thank you for the reply. I'l try to understand and use that.