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∂(ρϕ)∂t+div(ρϕu)=div(Γgradϕ)+Sϕ{"version":"1.1","math":"\frac{\partial (\rho \phi)}{\partial t}+ \textbf{div} (\rho \phi \textbf{u}) = \textbf{div}(\Gamma \textbf{grad} \phi) + S_\phi "}
In the transport equation, the quantity Γ{"version":"1.1","math":"<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>Γ</mi></math>;"} can represent: