[ranaat]

I have an experimental FEM prepared for Electrophoresis and DEP study.

I am primarily using the Electrostatics physics module and Microfluidics of COMSOL module as of now.

So far i have plotted the Electric field distribution using the following equation:

sqrt(Er*Er + Ephi+ Ephi+ Ez*Ez)

Specifically: sqrt(es2.Er*es2.Er+es2.Ephi*es2.Ephi+es2.Ez*es2.Ez )

Yes, my design is in r,phi,z coordinate system as evident from the equation.

My questions:

a) I am not sure how do i plot the Electric field gradient next i.e ∇E^2. The quantity should have units of V^2/m^3.

b) Is writing the custom equation the only way to plot this?