IRP=35 Power-law function

IRP = 35 Power-law relative permeabilities for all phases b = l, n, g:

krβ=[Sβ  −  Sβr1  −  Sβr]n{k_{r\beta }}\quad = \quad {\left[ {\frac{{{S_\beta }\; - \;{S_{\beta r}}}}{{1\; - \;{S_{\beta r}}}}} \right]^n}

Parameters are SlrS_{lr} = RP(1), SnrS_{nr} = RP(2), SgrS_{gr} = RP(3), n = RP(4).

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