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Old   December 2, 2017, 19:39
Default Star CCM+ Help
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yamifm0f is on a distinguished road
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
laminar flow
segregated multiphase temperature

for the phase interaction model I chose
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

Last edited by yamifm0f; December 2, 2017 at 21:13.
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