Writing Equation
 

Dear Friends,

I have to calculate an expression which includes a term as written below:

|Ui-Vi|

Where Ui and Vi are velocity vectors of gas and particles.

Could you plz suggest me how to write these vectors in expression.
In results I found velocities in x, y and z direction available in drop down list.

Thanks

Subtract each component and save them in an Expression
myVelU = Fluid.Velocity u - Gas.Velocity u
myVelV =...
myVelW=...
and create a User Variable Vector from these 3 components.

Or you can skip the variable and apply the norm directly to you expression like
myVelNorm = sqrt((myVelU)^2 +....)

Dear Matthias,

Thank you for the reply, I will follow this:

"myVelNorm = sqrt((myVelU)^2 +....)"

At the same time could you plz suggest me on how to create a User Variable Vector?


Regards

In CFD-Post--> click on Create Variable (little alpha) and select vector instead of scalar.

Thank you again Matthias, its great.