[Mohammad Jam]

Hi

i implemented especial heat transfer Eq. to chtMultiRegionFoam , it compiles correctly But when i run the case it gives this error :

--> FOAM FATAL ERROR:
Different dimensions for =
dimensions : [0 -1 0 1 0 0 0] = [0 1 -2 1 0 0 0]

i have checked all of Eq. Terms dimension and were OK.
Eq. is:

fvm::ddt(rho*cp, q)-fvm::laplacian(K, q)

K= conductivity [0 2 -1 0 0 0 0]
q= heat flux (vector field) [0 1 -1 1 0 0 0]
rho & cp = Non Dimensional terms

any idea?

thanks in advance

[agustinvo]

Originally Posted by Mohammad Jam

Hi

i implemented especial heat transfer Eq. to chtMultiRegionFoam , it compiles correctly But when i run the case it gives this error :



i have checked all of Eq. Terms dimension and were OK.
Eq. is:

K= conductivity [0 2 -1 0 0 0 0]
q= heat flux (vector field) [0 1 -1 1 0 0 0]
rho & cp = Non Dimensional terms

any idea?

thanks in advance

Hi,

it seems that in your equation you have a term like dT/dt...

let's see

fvm::ddt(rho*cp, q)
[0 0 -1 0 0 0 0] + [0 0 0 0 0 0 0] +[0 1 -1 1 0 0 0] = [0 1 -2 1 0 0 0]

fvm::laplacian(K, q) 			 		
[0 -2 0 0 0 0 0] + [0 2 -1 0 0 0 0] +[0 1 -1 1 0 0 0] = [0 1 -2 1 0 0 0]

Are they the only terms you have in the equation? How do you define the parameters?

[Mohammad Jam]

Originally Posted by agustinvo

Hi,

it seems that in your equation you have a term like dT/dt...

let's see

fvm::ddt(rho*cp, q)
[0 0 -1 0 0 0 0] + [0 0 0 0 0 0 0] +[0 1 -1 1 0 0 0] = [0 1 -2 1 0 0 0]

fvm::laplacian(K, q) 			 		
[0 -2 0 0 0 0 0] + [0 2 -1 0 0 0 0] +[0 1 -1 1 0 0 0] = [0 1 -2 1 0 0 0]

Are they the only terms you have in the equation? How do you define the parameters?

Hi Agustín,

Thank you for your kind reply,
Yes there was a [0 -1 0 1 0 0 0] term before solving Eq. and i removed it and then problem solved.

regards,
Mohammad