esys-escript

How to load a group of funnel shaped force to a circle?

Asked by Jingchi Yu

Hi, sir

I made a circle mesh through the Gmsh, and then I want to load a group of funnel shaped force on outer boundary to this circle.

The circle can be writed by wherezero(length(x-xc)-r), I already knew that.

My question is how to load a funnel shaped force?

Thank you very much!

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Adam Ellery (aellery) said : 		#1

Hi Jingchi,

I do not understand what you mean by a funnel shaped force. Could you please write down an expression for this function?

- Adam

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Lutz Gross (l-gross) said : 		#2

Not exactly sure what you want but assume you want to load the surface with normal stress/forces?

the best wat to do the is add surface elements in gmsh using

"Physical Surface("face1") =..".
"Physical Surface("face2") =..".

The normal is then given as "n=domain.getNormal()" which you can apply stress on face1 by using

mask=Scalar(0., FunctionOnBoundray())
mask.setTaggedValue("face1",1)
sn=mask*n

which would be "y" in the LinearPDE class.

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