several dumb questions 4

[steveworks123]

I am new to ANSYS, here are just several problems bugging me all the time. Can someone give me some hints? THank you in advance!!!

1.How do I model a spiral in ANSYS?

2.Sometimes when I draw a box(i.e. air domain) encompassing the model, the inside model is hidden by the outside box so that I could not operate on this inside model any more. Can someone tell me how to suppress the outside box and let ANSYS only show the inside structure?

3.In electromagnetic simulation, what do "flux-normal" and "flux-parallel" excatly mean? Where can I find some explanation for them? I do look at the ANSYS help file, but could not find some helpful hints.

I know ppl here are really deep in ANSYS, please bear with me for these naive questions.. : )

thank you !!

 

[cbrn]

Hi,
1- not trivial: you will have to build it as a series of splines. There is a thread somewhere in the past of this forum where this is deeply discussed, and someone posted a very useful APDL routine in order to model a spiral
2- use the selection filters: if the "outside box" is a volume, then Volumes - By Number/Pick - Unselect should work for you. You won't see immediate result of your action if you have turned off the immediate update of the display window: in this case, simply issue a "redraw". Please note that, by unselecting the volume, you won't unselect any underlying entity (area, line, keypoint, elem, node), so that if you issue a "plot - areas", for example, you will see all the areas of the unselected volume. The trick is then to do "Select - Everything below - selected volumes": note that it says "SELECTED": being the "outside box" UNselected by previous operation, the result will be that you unselect all the entities belonging to the "outside box"...
3- I'm not an expert of EM, so I figure it out from structural types of surface effects: normal or parallel refer to the orientation normal of the referenced surface: normal is colinear to the normal vector, parallel is colinear to the tangent vector...

Regards

 

[meshparts]

Hello,

To the third question:

At the interface of two different materials you get some part of the magnetic field "reflected" and some part of it "refracted". If the materials are very different (steel and air) then the most of the magnetic field will be captured inside of the steel and just a very small amount will pass into the air. Since the magnetic field can be represented by vectors, you get a normal and a tangential component on the interface between materials.

Regards,
Alex