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Performance boost to ViscosityPartialMelt_Costa_etal_2009 #203

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Jun 24, 2024
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Performance boost to ViscosityPartialMelt_Costa_etal_2009 #203

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22 changes: 10 additions & 12 deletions src/CreepLaw/MeltViscosity.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -185,18 +185,16 @@ end

# viscosity correction; where c_vf=crystal volume fraction and strain_rate is the strainrate in s^-1
function viscosity_correction(c_vf, Strain_Rate)
strain_rate = Strain_Rate
if strain_rate < eps(Float64)
strain_rate = 1.e-6
end
phi_max = 0.066499 * tanh(0.913424 * log10(strain_rate) + 3.850623) + 0.591806
delta = -6.301095 * tanh(0.818496 * log10(strain_rate) + 2.86) + 7.462405
alpha = -0.000378 * tanh(1.148101 * log10(strain_rate) + 3.92) + 0.999572
gamma = 3.987815 * tanh(0.8908 * log10(strain_rate) + 3.24) + 5.099645
num = 1.0 + (c_vf / phi_max)^delta
x = √(π) * c_vf / (2 * alpha * phi_max) * (1.0 + (c_vf / phi_max)^gamma)
den = (1.0 - alpha * erf(x))^(2.5 * phi_max)
mu_r = num / den
strain_rate = Strain_Rate + (Strain_Rate < eps(Float64)) * 1e-6
θ = log10(strain_rate)
ϕ_max = 0.066499 * tanh(0.913424 * θ + 3.850623) + 0.591806
δ = -6.301095 * tanh(0.818496 * θ + 2.86) + 7.462405
α = -0.000378 * tanh(1.148101 * θ + 3.92) + 0.999572
γ = 3.987815 * tanh(0.8908 * θ + 3.24) + 5.099645
num = 1 + (c_vf / ϕ_max)^δ
x = √π * c_vf / (2 * α * ϕ_max) * (1 + (c_vf / ϕ_max)^γ)
den = (1 - α * erf(x))^(2.5 * ϕ_max)
mu_r = num / den
return mu_r
end

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