Reflective boundary could not reflecting particles

User Support
1

Hi everyone,
When I run a simulation, the OpenMC interrupted unexpectedly.
And echo the Warning means Reflective boundary could not reflecting particles.
At first, I thought it was an accident. But secondly the Warning appears, the simulation broke down.
Has anyone ever encountered this？
Any answer will be appreciate!

#Update#

20220303ERROR
20220303ERROR764×527 71.5 KB

Same particles, same warning, same result.(surface 4 is reflective boundary)

Best regards!
Zhuangli

2

Hi Zhuang,

Is there only surface 4 is reflective in your model? Maybe you can try to change other surfaces to be reflective and see what will happen.

Best wishes,
Yiming

3

Hi Yiming,
Good morning!
There are 4 reflective surfaces of my case.Now I have dealt with the issue with more particles, But I have no idea what’s happen!

Best regards!
Zhuangli

4

Hi Zhuang,

I find your model is named the singleonePin_test. So I assume the four reflective surfaces are rectangular box surfaces. Trying the other way to model is cell. Such as:
box = openmc.rectangular_prism(width=pitch, height=pitch,
boundary_type=‘reflective’)
type(box)

If still appear the same problem, I feel you should check the surface of the fuel rod cylinder.

Ps: Do you have WeChat?

Best wishes,
Yiming