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Donde Tronem (donde)
New member
Username: donde

Post Number: 2
Registered: 11-2005
Posted on Wednesday, February 01, 2006 - 06:36 am:   

Hello!

Would you help me with the problem with point heat source

dt(u)=dx(dx(u))+q*delta(x-x0), 0<x<l,>0
u=u0 at t=0
u=u0 at x=0,L

solving by FlexPDE? Here delta(x-x0) is the Dirac delta function (Integral(0,L,delta(x-x0))=1), 0<x0<L, q is heat release.
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Robert G. Nelson (rgnelson)
Moderator
Username: rgnelson

Post Number: 526
Registered: 06-2003
Posted on Wednesday, February 01, 2006 - 06:38 pm:   

You can use POINT LOAD(U)= -q following the definition of the point x0 in the BOUNDARIES section. The sign is negative because all terms are moved to the left side of the equation before processing.

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