[swak4Foam] groovyBC set an initial unknown guess constant

ancolli · June 15, 2016, 07:13

My BC is as follow (for a scalar in laplacianFoam)

dT/dx=f(T,T0) (where f is nonlinear and T0 is unknown)

I solved the problem with groovyBC when T0 is known, applying N-R (Tn+1=Tn-function(Tn,T0)). it is working.

Now my problem is how to set T0 where is unknown (how to tell to groovyBC an started guessed value?
Thank u

rapierrz · June 15, 2016, 13:32

Hi Alejandro,

You can define this parameter in variables section in groovyBC.

ancolli · June 15, 2016, 13:46

but how?
If i define T0 in variables, for example

T0=5; Eq 1.
T0=T0+ f; Eq 2.

Where f depends of flux in the last iteration.
will use for all iterations T0=5 in eq 2.
I need T0 in the right of eq. 2 to be T0 of the left for the last iteration

June 15, 2016, 07:13	groovyBC set an initial unknown guess constant	#1
ancolli Senior Member Alejandro Join Date: Jan 2014 Location: Argentina Posts: 128 Rep Power: 12	My BC is as follow (for a scalar in laplacianFoam) dT/dx=f(T,T0) (where f is nonlinear and T0 is unknown) I solved the problem with groovyBC when T0 is known, applying N-R (Tn+1=Tn-function(Tn,T0)). it is working. Now my problem is how to set T0 where is unknown (how to tell to groovyBC an started guessed value? Thank u

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June 15, 2016, 13:32		#2
rapierrz Senior Member Hesam Join Date: Feb 2015 Posts: 139 Rep Power: 11	Hi Alejandro, You can define this parameter in variables section in groovyBC.

June 15, 2016, 13:46		#3
ancolli Senior Member Alejandro Join Date: Jan 2014 Location: Argentina Posts: 128 Rep Power: 12	but how? If i define T0 in variables, for example T0=5; Eq 1. T0=T0+ f; Eq 2. Where f depends of flux in the last iteration. will use for all iterations T0=5 in eq 2. I need T0 in the right of eq. 2 to be T0 of the left for the last iteration