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Normal components (inside & outside) of a vector field found at the interface

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Old   May 16, 2021, 10:38
Default Normal components (inside & outside) of a vector field found at the interface
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Hi.

I'm working on a two-phase flow simulation and have modified the interFoam solver to include the electrostatics component to get an electrohydrodynamic solver (similar to http://openfoamwiki.net/index.php/Co...ectromagnetics)

I'm calculating the electric field using the gradient of electric potential given by the equation \bold E = -\nabla \phi, which in my header file looks like:
Code:
E = -fvc::grad(Ue);
For my simulation, I'm interested in finding the normal component of E inside and outside the interface.


I've tried Paraview, where I applied contour to get the isosurface followed by normal glyphs. This gave me the normal component of E outside of the interface, and I was unable to get the normal component of E inside. Also, this isn't a quick process, and I want to know how I can createFields for both the normal components in my solver.

What I plan to understand is the following:
1. How to acquire(&code) the surface normal vector. This is what I've done (can be wrong, and if it is, do let me know).
Code:
	surfaceVectorField phiNormal
	(   mesh.Sf()/mesh.magSf()//(fvc::reconstruct(phi))/mag(fvc::reconstruct(phi))
	);
2. How to use this surface normal vector to find the 2 normal components.

I appreciate your time and would be grateful if I can get some assistance on this area.

Last edited by mcfdma; May 18, 2021 at 18:13.
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Old   May 18, 2021, 18:15
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I have attached an image to explain my question better. Normal inside and outside of the surface.
1200px-Normal_vectors2.svg.jpg
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ehd, electrohydrodynamic, interface, normal to surface

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