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Old   July 19, 2010, 15:12
Default Total Velocity
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selim
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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,
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Old   July 19, 2010, 18:40
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Glenn Horrocks
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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.
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Old   July 20, 2010, 03:29
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selim
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But the problem remains the same.

Mag=sqrt(u+v+w);

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
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Old   July 20, 2010, 07:11
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? 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.
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Old   July 21, 2010, 04:38
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Tommy
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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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