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yamifm0f December 2, 2017 19:39

Star CCM+ Help
 
Hello
I am studying mechanical engineering and I need to do a project with star ccm+ but I never used CFD programs before. I am trying to learn how to use the program for two-phase flow (Gas-Liquid) because my project focuses on the interaction between them.
I am trying to solve the Stefan problem with gas and water but I do not know how.
the model is 40 mm long with about 1 mm in height (hight does not matter because I want to model it as 1 D)
I set up my model as
Two Dimensional
Implicit Unsteady
Eulerian Multiphase
VOF
laminar flow
segregated multiphase temperature
gravity

for the phase interaction model I chose
VOF-VOF
VOF boiling
Rohsenow Boiling
interactive density

the material properties are

the density of both Gas and Water are 1 kg/m3
the mixture latent heat is 1000 kJ/kg
the surface tension is 0.01 N/m
T sat is 373.15
T wall is 383.15
specific heat for both is 1000 J/kgK
Thermal conductivity of water is 1 W/mK and for Gas is 0.1 W/mK
the viscosity of Water 0.01 Pas and for Gas is 1E-5 Pas


I chose the secondary phase Gas (H2O) and primary phase Water (H2O)

and made the VOF as composite and chose a specified filed for the gas on the right side wall

for the initial conditions,
the pressure was put as the atm pressure
static temp. was put as 373.15 K
velocity was put as 0 m/s

for the right wall boundary condition, I made the temperature specification in the physics condition as a temperature above saturation temp. of 383.15 K

The left wall, top wall, and bottom wall was put as plane symmetry

I know that there is something wrong with it. Can you help me??
Also, I want to specify the latent heat, so can you inform me how?
I figured out that it can be set as the heat of formation and standard static temp. in the material property but I do not understand. I remember seeing in the user guide that they put the latent heat as the heat of formation only, then what is the standard static temp. !!

Thank you in advance


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