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GfsBcNavier is used to impose a Navier slip condition (for velocity or Robin boundary condition for a tracer) of the form

vboundary = v0 + λn vboundary

where n is the derivative normal to the boundary and v0 and λ are parameters.

The syntax in parameter files is

[ GfsBc ] V0 LAMBDA

where V0 and LAMBDA are the parameters. Both V0 and LAMBDA are GfsFunctions.

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