whats the cause of error?
 

i have written three pressure BC.and then tried to do by groovyBC.although it seems equivalent to others it don't work.
if this problem resolve i think the trouble is removed.
fixedValue p:OK
totalPressure:OK
but groovyBC:
results in:
why?
thanks for quick helps.

the whole p is:
the problem is in p(other variables are ok as i tested)
I have to write BC in groovyBC form because of more complicated main case I have to solve.
thanks very much.please answer rapidly.;)

There are several issues:

• Divide by Zero Error I am taking a guess that there is a divide by zero in there
  Code:

  ---

  Floating point exception

  ---

  If I were to start to track that one down, I would look where a divide by zero might be. Looking at what you have provided...I would say its near
  
  Code:

  ---

  valueExpression "1023382.5/pow(1+(1.41)*magSqr(U)/(2*1.4*287.14*T),3.5)";

  ---

  which is equivalent to
  
  
  
  I see a T in the denominator, and if there is a zero there....one will have a divide by zero issue....this could be the problem
  
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Your BC may be giving the error when a boundary condition is corrected and has a T == zero for some reason. Honestly, without more information this is the best i can do with solving your issue...but its an educated guess at this point.

#OFProtip

thanks.T isn't zero and also its same for all three tests.but only in groovy it occurs.

did you try another time integration scheme? I see a backwardDdtScheme in your error message and there may be something happening there. Also, just to prove that its not the T in the denominator, change your value expression to

and give it a try.

i changed time scheme to Euler and changed T but error persists.initial U is zero and i changed it but the error didn't change
these are variable BC's:
p:
U:
T:
fvSolution is:
fvScheme:
and at last controlDict:

thanks for your effort to help dear Daniel.
It was because of new groovyBC.I changed to old version and it answer now.

OK, it is indeed your BC setup. I don't have the time to set this up for you, but i have some suggestions.

• go and look through the groovyBC examples, they will cover what you want. If you dont have them, google for them...they are out there :D
• Start with a simpler groovyBC that will be easier to debug.

Good luck

EDIT: read your new post that just mystically appeared....glad you figured it out :)

a question occur to me that I'm curious about.
when I set BC for U to zeroGradient or:
it answers without any error
but when I set it to:
it falls to an error on T(energy equation probably) as so:
I thought that internalField(U) or vector(internalField(U).x,0,0) do the same way as zeroGradient(or in groovyBC gradientExpression"0" does).
why?