unit vector direction at corner - PDE mesh

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Sunil Rana
Sunil Rana 2019-7-30
回答： Samatha Aleti 2019-8-2
Hello,
My question relates to a heat transfer PDE problem I have set up. The geometry is a simple rectangle, the sides of which align with x and y axes of cartesian coordinate system.
When it comes to setting the boundary conditions, I define Neumann condition using n · (c∇u)+qu=g, where n is the normal unit vector. I am struggling to understand how n is determined in general by Matlab. I also want to know the direction of n for nodes on corners of my rectangular domain. Is it in x direction, y direction or at 45 degrees?
I'd much appreciate a bit of basic explanation.
Many thanks,
Sunil.

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回答（1 个）

Samatha Aleti
Samatha Aleti 2019-8-2
You may refer to the following link for information on applying boundary conditions to PDE model
https://www.mathworks.com/help/pde/ug/pde.pdemodel.applyboundarycondition.html?s_tid=doc_ta
Hope this helps!

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