Assigning dielectric media to faces.

Altair Forum User

For Plane Wave solution at 24 GHz (MoM/MLFMM/ PO and MoM/MlFMM coupling):

1.

I have imported a cad file from soild works.

Media can be assigned to regions and faces both.

But in this import Feko does not display any region. Geometry consists of only faces.

Face is allowing only Metallic Media or PEC but not dielectric.

 

What should i do to assign dielectric media to this model?

 

2.

Also, if i simulate with PEC, i get error: EPSENT is too large or trianlge size is too small

How to approach this error?

 

3.

What happens if i increase extent of the model in Feko?

 

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JIF

Hello ManroopT,

 

What should i do to assign dielectric media to this model?

These faces should be unioned or stitched. When the faces form a closed region, CADFEKO will show the region for that part.

Please don't just select all the elements and union. I would suggest that you select elements close together that can be considered a logical unit and the union these and in so doing build the entire model by union together unions of faces.

 

 

Also, if i simulate with PEC, i get error: EPSENT is too large or trianlge size is too small

Have a look at

 

What happens if i increase extent of the model in Feko?

It is recommended that the model extents be set as small as possible for the geometry. Thus, if your model's maximum extent is 200, set the model extents to 5e2. If it is 700, you need to set it to 5e3, but if it is only 0.6, set it to 5e0. This ensures that the geometry is represented as accurately as possible. Note that changing the model extents effectively scales the geometry and could result in faulty faces that may need to be repaired (this only sometimes happens for imported geometry).