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Equations coupled through boundary conditions
Posted Sep 3, 2012, 6:58 p.m. EDT Version 4.3 1 Reply
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Hello,
I would need to solve a fluid flow equation coupled to a convection-diffusion equation (transport of diluted species in 2D).
However, the fluid velocity field and the particle concentration field are coupled through a boundary condition. (the model is that particles bind to the boundary and then move in one direction). The sliding velocity at the boundary is dependent on the particle concentration.
But when I (for example) choose the sliding velocity U_w at this boundary as U_w=c, Comsol does not seem to take the coupling between the fluid and the concentration field into account (the fluid flow is inhomogeneous, but the concentation stays homogeneous even though one should assume that the concentration profile changes if particles get transported)
Do you know if there is a good method to implement this system and to consider the coupling between the fluid and the active particles solved in it?
Many thanks!
I would need to solve a fluid flow equation coupled to a convection-diffusion equation (transport of diluted species in 2D).
However, the fluid velocity field and the particle concentration field are coupled through a boundary condition. (the model is that particles bind to the boundary and then move in one direction). The sliding velocity at the boundary is dependent on the particle concentration.
But when I (for example) choose the sliding velocity U_w at this boundary as U_w=c, Comsol does not seem to take the coupling between the fluid and the concentration field into account (the fluid flow is inhomogeneous, but the concentation stays homogeneous even though one should assume that the concentration profile changes if particles get transported)
Do you know if there is a good method to implement this system and to consider the coupling between the fluid and the active particles solved in it?
Many thanks!
1 Reply Last Post Sep 4, 2012, 8:05 a.m. EDT
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Posted:
1 decade ago
I will also attach my project file
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