The viscosity field

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 May 27, 2001, 12:03 The viscosity field #1 Mehdi BEN ELHADJ Guest   Posts: n/a In PHOENICS code, the density field can be calculated in SEM or in HOL methods as follows: RHO = RHOG * (1-VFOL) + RHOL * VFOL (it's logical) G: for Gaz L: for Liquid VFOL: Volume Fraction of Liquid but why ? the viscosity field is calculated as follows: ENUL = ENULG * (1-VFOL) + ENULL * VFOL

 May 27, 2001, 13:50 Re: The viscosity field #2 silver Guest   Posts: n/a Look to the one-fluid formulation. To be prefectly correct the Indicator function (VFOL) is suppose to be a heavyside (step) function . so RHO is NOT a mixture but is EITHER a gas or liquid. this is also true for viscosity. Now we introduce our VOF, replace our step function with a volume intergral and people attempt to place some physics where we have averaged them all out. so... ----------------------------------------------------- Q.. why ? the viscosity field is calculated as follows: A.. That is just what the final form of the equations came to when we put all of our assumptions.. -----------------------------------------------------

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