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ODE as source term in transient heat transfer model
Posted May 13, 2011, 10:03 p.m. EDT 1 Reply
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Hi,
As a heat source, I have an ODE expression: dA/dt = (k1+k2*A^m)*(1-A)^n, A(0) = 0. I am unable to figure out how to incorporate it.
Initially, I declared a heat source Q = At (i.e. dA/dt)
and I added ODE & DAE (ge) to define the ode equation.
where I declared the following:
Name; A
function f(u,ut,utt,t)=0 => At-(k1+k2*A^m)*(1-A)^n
Unfortunately, it does not work.
I would appreciate if any one can point to the right direction.
Regards,
Susant
As a heat source, I have an ODE expression: dA/dt = (k1+k2*A^m)*(1-A)^n, A(0) = 0. I am unable to figure out how to incorporate it.
Initially, I declared a heat source Q = At (i.e. dA/dt)
and I added ODE & DAE (ge) to define the ode equation.
where I declared the following:
Name; A
function f(u,ut,utt,t)=0 => At-(k1+k2*A^m)*(1-A)^n
Unfortunately, it does not work.
I would appreciate if any one can point to the right direction.
Regards,
Susant
1 Reply Last Post May 14, 2011, 4:34 p.m. EDT
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Posted:
1 decade ago
Hi
what didnt work? if you have defined k1,k2,m,n and the BC A(0)=0 ?
apart perhaps if A was already used, (it's normally used by COMSOL for the magnetic field field vector "A") in wich case you might get a duplicated variable error, that you sould resolve by calling our variable AA insterad of A
--
Good luck
Ivar
what didnt work? if you have defined k1,k2,m,n and the BC A(0)=0 ?
apart perhaps if A was already used, (it's normally used by COMSOL for the magnetic field field vector "A") in wich case you might get a duplicated variable error, that you sould resolve by calling our variable AA insterad of A
--
Good luck
Ivar