Learning Forum

[Shyam Prasad V Atri]

Hello

I would like to modify this term

i would like to add this term to the equation -vec(c)Y into this equation please tell me how can this be achieved

[Rob]

You've only really got access to the diffusivity, so it's not overly simple. What is the extra term for?

[Shyam Prasad V Atri]

the extra term is to account for a separate drift velocity of the field (vec(c)). i thought of adding it as source term but the source term is adding or removing species right. Can we do it that way? if so can you please suggest how?

[Rob]

Won't convection of the flow handle that? 

[Shyam Prasad V Atri]

convection only has fluid velocity field. I have another field acting in the domain. 

[Rob]

If you're thinking of species drift and separation then you're breaking the species model mixture assumption. The multiphase models allow for phase specific forces but don't have diffusion. There's nothing stopping you having a species volume fraction linked source term. 

[Shyam Prasad V Atri]

no so the extra drift velocity is acting on all species. I am adding the body force term in the momentum equation to account for that.