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Entering source term
Posted Jun 26, 2013, 3:13 p.m. EDT 1 Reply
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hi
Please, what do I do to enter the equation in the attached file as the source term of heat energy equation for solification process in comsol multiphysics.
Please check the attached file.
I am write this way:
S=d(((Th_Cond(T)/cp_s2)*d((cp_s2-cp)*T,r)),r)+d(((Th_Cond(T)/cp_s2)*d((cp_s2-cp)*T,z)),z)-d((rho_ls(T)*(1-B)*u*((cp_l-cp_s2)*T)),r)-d((rho_ls(T)*(1-B)*w*((cp_l-cp_s2)*T)),z)
If so what other things needed to be done
Please, what do I do to enter the equation in the attached file as the source term of heat energy equation for solification process in comsol multiphysics.
Please check the attached file.
I am write this way:
S=d(((Th_Cond(T)/cp_s2)*d((cp_s2-cp)*T,r)),r)+d(((Th_Cond(T)/cp_s2)*d((cp_s2-cp)*T,z)),z)-d((rho_ls(T)*(1-B)*u*((cp_l-cp_s2)*T)),r)-d((rho_ls(T)*(1-B)*w*((cp_l-cp_s2)*T)),z)
If so what other things needed to be done
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1 Reply Last Post Jun 27, 2013, 6:01 a.m. EDT
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Posted:
1 decade ago
Hi,
Just looking at your equation system, I would do it the following way:
Define all these under variables:
Hs=cp_s2*T
H=cp*T
Keff=Th_Cond(T)
fs=xx
u =xx
us=xx
v=xx
vs=xx
cs=xx
S=1/r*d(r*keff/cs*d(Hs-H,r),r)+d(keff/cs*d(Hs-H,z))-d(rho*fs*(u-us)*(Hs-H),r)-d(rho*fs*(v-vs)*(Hs-H),z)
Finally, in the source term, I would just input S as the variable.
I am not questioning your formulation, but just be careful in dealing with axisymmetric problems.
But anyway double check.
Suresh
Just looking at your equation system, I would do it the following way:
Define all these under variables:
Hs=cp_s2*T
H=cp*T
Keff=Th_Cond(T)
fs=xx
u =xx
us=xx
v=xx
vs=xx
cs=xx
S=1/r*d(r*keff/cs*d(Hs-H,r),r)+d(keff/cs*d(Hs-H,z))-d(rho*fs*(u-us)*(Hs-H),r)-d(rho*fs*(v-vs)*(Hs-H),z)
Finally, in the source term, I would just input S as the variable.
I am not questioning your formulation, but just be careful in dealing with axisymmetric problems.
But anyway double check.
Suresh