### Modeling the cusp confined volume inside EMCC machine

Posted:

**Mon Aug 24, 2015 6:20 pm**Hello All,

In theirrecent paper, the EMC2 team listed the cusp confined volume as 5000 cm^3. That is crazy big. If that was shaped as a sphere, it would nearly fill the whole ring volume.

This is too scale. Here is my question: what is the magnetic field vector field outside this plasma volume?

There is an easy way to estimate this: treat the vector field made by the B field like a flowing fluid and solve it with some free CFD software. I would start with a two dimensional simulation.

I am trying to use simFLOW to do this CFD simulation. A couple of issues I am having:

1. Doing a 2D simulation does not seem possible (or easier) in simFLOW. I switched to 3D.

2. Fortunately, I can import the ring geometry into simFLOW using STL files.

3. How do I define the boundary conditions?

All the X-, Y- and Z- faces are planes of symmetry. But, the positive faces need to be broken up into “inlet” and “outlet” surfaces. How do I do that?

4. How do I mesh the space between the rings and the spherical surface only?

In theirrecent paper, the EMC2 team listed the cusp confined volume as 5000 cm^3. That is crazy big. If that was shaped as a sphere, it would nearly fill the whole ring volume.

This is too scale. Here is my question: what is the magnetic field vector field outside this plasma volume?

There is an easy way to estimate this: treat the vector field made by the B field like a flowing fluid and solve it with some free CFD software. I would start with a two dimensional simulation.

I am trying to use simFLOW to do this CFD simulation. A couple of issues I am having:

1. Doing a 2D simulation does not seem possible (or easier) in simFLOW. I switched to 3D.

2. Fortunately, I can import the ring geometry into simFLOW using STL files.

3. How do I define the boundary conditions?

All the X-, Y- and Z- faces are planes of symmetry. But, the positive faces need to be broken up into “inlet” and “outlet” surfaces. How do I do that?

4. How do I mesh the space between the rings and the spherical surface only?