Learning Forum

[givi18]

In the ANSYS FLUENT, the units for diffusivity are kg/(ms) while the conventional units for diffusivity (m^2/s). so it means that Fluent is solving  

I have to solve this equation  d/dt= D div(div )+ s . If I multiply all the parameters with the current equation will be: d()/dt= D div(div )+ s. I was wondering if it is the correct way to change my equation to the fluent format.

 

thanks in advance for your help.

 

∂ϕ∂t=D∇2ϕ+S

∂ϕ∂t=D∇2ϕ+S

∂ϕ∂t=D∇2ϕ+S 

[Rob]

The formatting went a little wrong.  Simple answer, UDS is a scalar with no material properties: so scalar diffusivity has no knowledge of material density. Have a look at scalar diffusivity and compare with the species diffusivity sections of the manual.