Moving heat source
 

Hi guys,
I want to simulate the following equation:
$ \frac{dT}{dt} -v \frac{dT}{dx}= \frac{k}{\rho Cp} \nabla^{2} T +S $
Now I am little bit confused about v, i.e velocity. In OpenFOAM, whether I have to set up as boundary condition or internal field ?
Thanks in advance.