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Using a function for Permeability value

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Hello!

I am new to the software. I am modeling fluid flow through the annulus of a pipe coupled to a porous media and am using the Free and Porous Media Flow physics interface. The permeability of the porous material is a function dependant on length of the material. The equation (from experimental data) is: f(x)=exp(-0.077*x+3.9)

It will not let me put this in directly because:

a) x is only in meters, not meters squared
b) it is having trouble understanding exp(x), instead of just a value

Any ideas are appreciated!

Amber

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