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Merged
SteveMaas1978 merged 1 commit into from
Mar 6, 2026
Merged

Update Tangent_ShearViscosity_StrainRate #124

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6 changes: 3 additions & 3 deletions FEBioFluid/FEBinghamFluid.cpp
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Expand Up @@ -103,12 +103,12 @@ double FEBinghamFluid::Tangent_ShearViscosity_StrainRate(FEMaterialPoint& mp)
{
FEFluidMaterialPoint& vt = *mp.ExtractData<FEFluidMaterialPoint>();
mat3ds D = vt.RateOfDeformation();
double dmu = 0;
double dmu_dgdot = 0;
double gdot = sqrt(2 * (D.sqr()).tr());
if (gdot > 0) {
dmu = m_tauy / pow(gdot, 2) * ((1 + m_n * gdot) * exp(-m_n * gdot) - 1);
dmu_dgdot = m_tauy / pow(gdot, 2) * ((1 + m_n * gdot) * exp(-m_n * gdot) - 1);
}
return dmu;
return dmu_dgdot;
}

//-----------------------------------------------------------------------------
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4 changes: 3 additions & 1 deletion FEBioFluid/FECarreauFluid.cpp
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Expand Up @@ -105,7 +105,9 @@ double FECarreauFluid::Tangent_ShearViscosity_StrainRate(FEMaterialPoint& mp)

double dmu = 2 * (m_mu0 - m_mui) * (m_n - 1) * m_lam * m_lam * pow(1 + lamg2, (m_n - 3) * 0.5);

return dmu;
double dmu_dgdot = 0.5 * gdot * dmu;

return dmu_dgdot;
}

//-----------------------------------------------------------------------------
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4 changes: 3 additions & 1 deletion FEBioFluid/FECarreauYasudaFluid.cpp
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Expand Up @@ -110,7 +110,9 @@ double FECarreauYasudaFluid::Tangent_ShearViscosity_StrainRate(FEMaterialPoint&
double dmu = (m_a >= 2) ? 2 * (m_mu0 - m_mui) * (m_n - 1) * pow(m_lam, m_a) * pow(gdot, m_a - 2)
* pow(1 + lamga, (m_n - m_a - 1) / m_a) : 0;

return dmu;
double dmu_dgdot = 0.5 * gdot * dmu;

return dmu_dgdot;
}

//-----------------------------------------------------------------------------
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4 changes: 3 additions & 1 deletion FEBioFluid/FECrossFluid.cpp
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Expand Up @@ -106,7 +106,9 @@ double FECrossFluid::Tangent_ShearViscosity_StrainRate(FEMaterialPoint& mp)

double dmu = -2 * (m_mu0 - m_mui) * m_m * pow(m_lam, m_m) * pow(gdot, m_m - 2) / pow(1 + pow(lamg, m_m), 2);

return dmu;
double dmu_dgdot = 0.5 * gdot * dmu;

return dmu_dgdot;
}

//-----------------------------------------------------------------------------
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4 changes: 3 additions & 1 deletion FEBioFluid/FEPowellEyringFluid.cpp
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Expand Up @@ -107,7 +107,9 @@ double FEPowellEyringFluid::Tangent_ShearViscosity_StrainRate(FEMaterialPoint& m
double dmu = (lamg < 1e-3) ? -2 * (m_mu0 - m_mui) * m_lam * m_lam / 3. :
(2 * (m_mu0 - m_mui) * (gdot / sqrt(1 + pow(lamg, 2)) - asinh(lamg) / m_lam)) / pow(gdot, 3);

return dmu;
double dmu_dgdot = 0.5 * gdot * dmu;

return dmu_dgdot;
}

//-----------------------------------------------------------------------------
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5 changes: 4 additions & 1 deletion FEBioFluid/FEQuemadaFluid.cpp
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Expand Up @@ -107,7 +107,10 @@ double FEQuemadaFluid::Tangent_ShearViscosity_StrainRate(FEMaterialPoint& mp)
double gdot = sqrt(2 * (D.sqr()).tr());
double grsqrt = sqrt(gdot / m_gc);
double dmu = (gdot > 0) ? 4 * m_mu0 * m_H / m_gc * (m_k0 - m_ki) * (1 + grsqrt) / grsqrt / pow(-2 * (1 + grsqrt) + m_H * (m_k0 + m_ki * grsqrt), 3) : 0.0;
return dmu;

double dmu_dgdot = 0.5 * gdot * dmu;

return dmu_dgdot;
}

//-----------------------------------------------------------------------------
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