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How can I have a "Free drainage" boundary condition? (for Richard's eq, Earth Science Module)

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Hello everyone,
I work with the Richards's equation (Earth Science Module) a model that consists in the vertical infiltration of water in a soil column.
At the bottom of the transport domain I want to impose a FREE DRAINAGE boundary condition ( that is an UNIT GRADIENT).
By working with the Richard's equation, the module only gives me the following options for the boundary conditions:
Pressure
Zero flow
Atmosphere gauge gold
Inward flows
Mixed (mix of Dirichlet, Newman and Cauchy conditions).

How can I do to have the condition of "free drainage"?

I'll be very grateful for your help,

M.


2 Replies Last Post 2011年11月17日 GMT-5 00:20
COMSOL Moderator

Hello Mart M

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Posted: 1 decade ago 2011年4月15日 GMT-4 20:56
Did anyone answer this question? I have the same problem.
Did anyone answer this question? I have the same problem.

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Posted: 1 decade ago 2011年11月17日 GMT-5 00:20
By specifying a inflow boundary equal to

-dl.kr*dl.Ksyy

By specifying a inflow boundary equal to -dl.kr*dl.Ksyy

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