[xirtam]

After scaling the variables as follows,

[Theta] = [0 0 0 0 0 0 0];
[H] = [0 1 0 0 0 0 0];
[K] = [0 1 -1 0 0 0 0];

fvScalarMatrix ThetaEqn
(
fvm::ddt(Theta)
==
fvc::laplacian(K,H)
+ gradkz
);

this message appeared:

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

Does anyone know what to do?