Multiple boundary conditions with DAGMC

User Support
1

Hi all,

I am importing .step geometry in OpenMC using DAGMC. I would like to exploit the symmetry of my model, thus apply reflective boundary conditions (BC) on some surfaces and vacuum BC on others, similarly to the picture:

reflective
reflective182×155 5.58 KB

Up to now, to import the geometry and to apply a vacuum BC to the model I did something like this:

dagmc_univ = openmc.DAGMCUniverse(filename='filename.h5m').bounded_universe()
geometry = openmc.Geometry(root=dagmc_univ)
geometry.export_to_xml()

Clearly, this approach is not suitable for my goal since it allows just for one BC for the whole domain.

Is there a way to apply different BC on each surface?
Thanks

2

You can try:

dagmc_univ = openmc.DAGMCUniverse(filename='filename.h5m')

vacuum_radius = 10
# Creating a bounding box

## X and Y reflective BC
px = openmc.XPlane(boundary_type = "reflective", name = "reflective boundary on X-axis")
py = openmc.YPlane(boundary_type = "reflective", name = "reflective boundary on Y-axis")

## Vacuum boundary as a cylinder
cyl = openmc.ZCylinder(x0=0.0, y0=0.0, r=vacuum_radius, boundary_type = "vacuum")

region = (+px & +py & -cyl)

containing_cell = openmc.Cell(region=region, fill= dagmc_univ)

geometry = openmc.Geometry(root=[containing_cell])
geometry.export_to_xml()

Best,