Tangential Vector Tolerance

gpwakeham · January 20, 2014, 22:49

Hi I am doing simulation with a curved wall that has a velocity and I know that the velocity components have to be tangential.

But because for this particular geometry I don't have any information on it I just chose a velocity vector that suited most of the wall, and my idea to get around it (just for this case) was to increase the tangential vector tolerance in expert parameters however although I have chosen 35 degrees (which is higher than the max difference) it still comes up with the error

Is there something else that has to be done? or is there a limit on this tolerance?

ghorrocks · January 21, 2014, 05:16

If you know the wall's shape then you should be able to define a function to make it tangential. Alternately use a 3D interpolation function to define the tangential direction. I think there is also a variable which gives the wall surface normal, but I can't remember it. You could also use the gradient of the wall distance variable.

Widening the tolerance means that your tangential velocity is not very tangential and would lead to weird convergence behaviour. Better to define the velocity to be tangential in the first place.

gpwakeham · January 21, 2014, 06:36

Thanks for your help.

Yeah I will stop been lazy and just do it the proper way, I just thought I could sneak this one through for a quick test.

January 20, 2014, 22:49	Tangential Vector Tolerance	#1
gpwakeham New Member George Wakeham Join Date: Sep 2011 Posts: 5 Rep Power: 14	Hi I am doing simulation with a curved wall that has a velocity and I know that the velocity components have to be tangential. But because for this particular geometry I don't have any information on it I just chose a velocity vector that suited most of the wall, and my idea to get around it (just for this case) was to increase the tangential vector tolerance in expert parameters however although I have chosen 35 degrees (which is higher than the max difference) it still comes up with the error Is there something else that has to be done? or is there a limit on this tolerance?

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January 21, 2014, 05:16		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	If you know the wall's shape then you should be able to define a function to make it tangential. Alternately use a 3D interpolation function to define the tangential direction. I think there is also a variable which gives the wall surface normal, but I can't remember it. You could also use the gradient of the wall distance variable. Widening the tolerance means that your tangential velocity is not very tangential and would lead to weird convergence behaviour. Better to define the velocity to be tangential in the first place.

January 21, 2014, 06:36		#3
gpwakeham New Member George Wakeham Join Date: Sep 2011 Posts: 5 Rep Power: 14	Thanks for your help. Yeah I will stop been lazy and just do it the proper way, I just thought I could sneak this one through for a quick test.