# Total Velocity

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 July 19, 2010, 15:12 Total Velocity #1 New Member   selim Join Date: Sep 2009 Location: UK Posts: 19 Rep Power: 8 Hi, May be a stupid question? I have U and V velocity, I dont have total velocity (after loading data into tecplot from CFX output--cngs) How can I obtain in tecplot total velocity and make contour of it? In Equation it seems I am allowed to only define scalars? Magnitude I can define, but I want to visualise also some flow reversal, total velocity? Thanks,

 July 19, 2010, 18:40 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 11,610 Rep Power: 91 Velocity magnitude is available by default in CFD-Post. Looks like in tecplot you don't get it. You will have to define velocity magnitude as an equation, as a function of U, V and W. Then it will be a scalar variable that you can do what you like with.

 July 20, 2010, 03:29 #3 New Member   selim Join Date: Sep 2009 Location: UK Posts: 19 Rep Power: 8 But the problem remains the same. Mag=sqrt(u²+v²+w²); then it takes always positive values. I just want to have Total_Vel=u*i+v*j+w*k, i,j,k---unit vectors Thanks

 July 20, 2010, 07:11 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 11,610 Rep Power: 91 ? Of course Velocity Magnitude is always positive. It is the magnitude of a vector. I don't know tecplot too well so don't know how they deal with vectors. Generally when you set up a vector field object you define what scalar variable it is to take the X, Y and Z components from. I am sure tecplot will be the same.

 July 21, 2010, 04:38 #5 New Member   Tommy Join Date: Jul 2010 Posts: 10 Rep Power: 7 I think tecplot should be able to draw contour of velocity magnitude basing on the velocity vector. Are you sure it's uncapable of that?

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