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Prakash Vempati (pvempat1)
New member
Username: pvempat1

Post Number: 1
Registered: 03-2007
Posted on Thursday, March 29, 2007 - 04:21 pm:   

Hi Robert Nelson,

I have a sample problem that I would really appreciate if you can help me with.

I am trying to make a pill-shaped cell (like an E. Coli - a cylindrical tube + 2 hemispherical end caps) in a rectangular box, with the cell oriented vertically along the z-axis (in cartesian3).

On my test code, I am solving a simple heat diffusion problem with the surface of the pill at u=5, and the boundaries of the rectangular space at u=0.

I am having trouble specifying the boundary values on the end-caps of the cell. To make these, I am using regional surfaces, for the code is not recognizing the boundaries.

I attached my code. It is ready to run. What I get is that heat is generated only from the cylinder part of the cell but not the caps.

What is wrong with my code?
Thank you Sincerely.


application/octet-streamE coli heat flow
TipCellHeat.pde (1.3 k)
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Robert G. Nelson (rgnelson)
Moderator
Username: rgnelson

Post Number: 802
Registered: 06-2003
Posted on Thursday, March 29, 2007 - 11:52 pm:   

Read "Help | User_Guide | Using FlexPDE in 3-dimensional Problems" again.

Your regions 3 and 4 repeat and hide region 2.
You have only two regions in projection: the outer box and the cylinder.

You must attache boundary conditions to the top and bottom surfaces of the culinder using SURFACE qualifiers inside the definition of region 2.

See attached.
application/octet-stream
TipCellHeat.pde (1.1 k)

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