wx = dw/dy - dv/dz wy = du/dz - dw/dx wz = dv/dx - du/dy

w = wx(i) + wy(j) + wz(k)

vorticity magnitude = sqrt(w.w) = sqrt( wx*wx +wy*wy +wz*wz

but how could i define the function into CFD post template?eg:CFX5-POST,FIELD-ViEW,CFD-View

If you do not know how to add variables for the format used in those softwares, the easiest way is to replace one of the existing variables (e.g. temperature or pressure) with that of the vorticity magnitude.

Tosh

Click on create variable then type in the following expressions

Vort X = 0.5*(Velocity v.Gradient Z-Velocity w.Gradient Y) Vort Y = 0.5*(Velocity w.Gradient X-Velocity u.Gradient Z) Vort Z = 0.5*(Velocity u.Gradient Y-Velocity v.Gradient X)

Vorticity = sqrt(Vort X^2+Vort Y^2+Vort Z^2)

Thank you very much

Hi

The variable doesn't work. I've tried that.

I'm trying to create helical density which is the dot product of the velocity vector and vorticity. could someone please help. I want to know how to enter it in the expression block in CFD-View