# Age of multiplephase flows fluids

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 September 29, 2006, 04:03 Age of multiplephase flows fluids #1 Michael B Guest   Posts: n/a Hi. I'm doing a multiphase flow calculation involving gas and dispersed solid particles. I am a using a Euler-Euler approach. I have a geomtry with several inlets and the solid particles are injected in the most downstream of them. Only one outlet is there. I would like to know the residence time for the particles compared to the fluid, so I have followed the guide from Robin from 2005: http://www.cfd-online.com/Forum/cfx_...cgi/read/11571 I can easily come up with the residence time for the fluid, but the solid particles are harder to get. I have set up two additional variables. Age and Age solids in order to compute the Age for each phase: LIBRARY: ADDITIONAL VARIABLE: Age Option = Definition Tensor Type = SCALAR Units = [s] Variable Type = Volumetric END END LIBRARY: ADDITIONAL VARIABLE: Age solid Option = Definition Tensor Type = SCALAR Units = [s ] Variable Type = Volumetric END END I have then created two identical subdomains, where only the Age Solid and Age differs. SUBDOMAIN: Subdomain 1 Coord Frame = Coord 0 Location = FLUID BULK SOURCES: Option = Use Volume Fraction EQUATION SOURCE: Age Option = Source Source = 1 [m m^-1] END END END SUBDOMAIN: Subdomain meal Coord Frame = Coord 0 Location = Assembly BULK SOURCES: Option = Use Volume Fraction EQUATION SOURCE: Age solid Option = Source Source = 1 [m m^-1] END END END END My problem is that the solid particles have age values between -10^24 and 10^24 and obviously are wrong. What I am doing wrong? Please help

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