# How to view Vector Plot of Secondary Flow in Post?

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 December 2, 2004, 04:01 How to view Vector Plot of Secondary Flow in Post? #1 dan Guest   Posts: n/a Hi, I'm hoping to investigate the secondary flow at a particular plane of my domain. However, I can't find the variable tangential Velocity, Vtheta for the vector plot in the Post 5.7. I use the cyclindrical vel components as inlet bc. Can anyone please tell me how to look at the tangential velocity component in Post? I only find Vx, Vy, Yz.... How to view Vtheta, Vr & Vaxial? Thanks a lot, Dan.

 December 2, 2004, 11:01 Re: How to view Vector Plot of Secondary Flow in P #2 hannah Guest   Posts: n/a I just know when you creat a vector at the plane you specify, you can choose the vector projection parrmeter(none, tangential or normal on the plane) in this vector pop-up menu. if that's what you need? good luck hannah

 December 3, 2004, 04:41 Thank you #3 dan Guest   Posts: n/a Hi Hannah, Yes. That's what I'm after.... Thanks a lot.

 January 12, 2010, 16:56 Re: How to view Vector Plot of Secondary Flow in P #4 New Member   Join Date: Jan 2010 Posts: 27 Rep Power: 10 hi I have a project about it, until now i know that have to choose "tangential" in the vector part to viwe it? but i dont know if it is correct or not? also i want to know how much the wall can affect the secondary flow in the open channels(being small or big dimention of channel)?

 September 27, 2012, 07:02 #5 New Member   Join Date: Jun 2011 Posts: 15 Rep Power: 8 Dear colleagues, I would need the tangent component of velocity along a 3D circular arc surface. Does anyone know how to get the tangent velocity as a variable and not necessarily presented as a vector plot? I am not sure the circumferential velocity variable calculated by the Turbo Post (in my case omega=0) can be considered as a reasonably good approximation of the tangent velocity. Best, Sal

 September 27, 2012, 07:42 #6 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 14,202 Rep Power: 110 You can define a variable in CFD-Post to be any function you like - so you can do the transformation into a tangential velocity about any axis you want. Also consider a local frame of reference, that may make things easier.

 September 27, 2012, 09:01 #7 New Member   Join Date: Jun 2011 Posts: 15 Rep Power: 8 Thanks Glenn for your reply! I am aware of that - I just wanted to know whether there is an easier way of doing it

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