MCNP Geometry Error when I try to create a sliced geometry in a torus structure

[Osas]

In a study I did in MCNP, I want to create a sliced geometry in a torus structure. But MCNP cannot calculate the volume of the geometry I created. What should I do about this issue?

2 0 -50 -12 13
3 0 #2

12 pz 34.4985
13 pz -34.4985
50 ty 0 0 0 620 200 200

 

[Alex A]

Hello @Osas, welcome to PhysicsForums.

It's quite common for the automatic volume routine to fail. The actual volume can be added to the cell definition using "vol=", or with a divisor card SD. Usually it's only needed if the cell has a tally. Such a thin slice is quite close to a pair of cylinders, so Pi*200*200*70*2 might be good enough for most purposes.

 

[Osas]

Hello @Osas, welcome to PhysicsForums.

It's quite common for the automatic volume routine to fail. The actual volume can be added to the cell definition using "vol=", or with a divisor card SD. Usually it's only needed if the cell has a tally. Such a thin slice is quite close to a pair of cylinders, so Pi*200*200*70*2 might be good enough for most purposes.

Thank you so much for your answer Alex but in output file,
reason volume
not calculated

asymmetric

I come across with this, how can I solve this?