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why laplacian() failed

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Old   January 27, 2010, 06:24
Unhappy why laplacian() failed
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Jean P. Dubois
Join Date: Jan 2010
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OFCrash is on a distinguished road
Hi guys im a newbie, i got a problem wired well..

i have 2 equations:
dT/dt=1/a*(div(b*grad(T)+div(c*grad(wl))) (1)
dwl/dt=1/d*(div(e*grad(T)+div(f*grad(wl))) (2)

a--f are functions of T and wl

so i give my solver here
fvm::ddt(T) (1)

fvm::ddt(wl) (2)

my ideas here is to separate the T and wl, so in (1)
"wl" is considered as known(fvc: and in (2) "T" is
considered as known(calculated from 1).

problem: the solver is compiled without errors and
it works but the results staye as initial conditions,
the "T" ad "wl" i got didnt change, they are around
the initial conditions and no convergence at all even
run longtime. it seems laplacian failed when reading
bundary conditions.

note: scheme of laplacian is linear corrected
scheme of ddt(T) backward
initial condition: uniform
bundary condition:timeVaryingUniformFixedValue

thanks for all of your advices welcom~~
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Old   February 1, 2010, 08:32
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Jean P. Dubois
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i tried another solver here
fvm::ddt(T) (1)

fvm::ddt(wl) (2)

this time the T and wl are resolved but the results of
T and wl are not good well, coz we couldnt get the
coeff "bcef" out of laplacian() if the "bcef" depend on
the T and wl.

so any1 have some ideas ?
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