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Help to simulate evaporation in ANSYS Fluent

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Old   April 3, 2014, 15:25
Default Help to simulate evaporation in ANSYS Fluent
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Hello

Iím trying to simulate water evaporation in Ansys Fluent 14.0 and Iím relatively new with the software.

I donít know if someone can help me with the simulation?

These are the parameters that I introduce in Fluent.

Analysis: 2D, Double Precision

Scale: Specify Scaling Factors: X=Y=0,01
View Length Unit in:m

General Settings: Pressure-Based
Transient
Absolute
Gravity (y=-9,81)

Models: Multiphase->VOF
Energy->ON

Materials: Air
Water-liquid

Phases: Air=Primary Phase
Water-liquid=Second Phase
Interaction-> Mass Tab->Mechanism->Evaporation-condensatio
Interaction-> Surface Tension Tab ->Surface Tension Force Modeling->ON

Boundary Conditions: inlet (Phase=mixture)->Edit->Momentum Tab-> Velocity Magnitude(m/s)=0,5
inlet (Phase=water-liquid)->Edit->Multiphase Tab->Volume Fraction=1
Wall (Phase=wŠter-liquid)->Edit->Thermal Tab->Temperature (k)=373

Solution Methods: Pressure-Velocity Coupling->SIMPLE
Spatial Discretization->Gradiet->Least Squares Cell Based
Spatial Discretization->Pressure->PRESTO!
Spatial Discretization->Momentum->QUICK
Spatial Discretization->Volumen Fraction-> QUICK
Spatial Discretization->Energy-> QUICK

Solution Initialization: Standard

Patch:Phase->Mixture
Variable->Temperature
Value(K)->1
Zones to Patch->Fluid_air & Fluid_water

Run:Time Step Size(s)->1e-05
Number of Time Steps->1000
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Old   April 8, 2014, 05:09
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Ali
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Quote:
Originally Posted by german.gd20 View Post
Hello

Iím trying to simulate water evaporation in Ansys Fluent 14.0 and Iím relatively new with the software.

I donít know if someone can help me with the simulation?

These are the parameters that I introduce in Fluent.

Analysis: 2D, Double Precision

Scale: Specify Scaling Factors: X=Y=0,01
View Length Unit in:m

General Settings: Pressure-Based
Transient
Absolute
Gravity (y=-9,81)

Models: Multiphase->VOF
Energy->ON

Materials: Air
Water-liquid

Phases: Air=Primary Phase
Water-liquid=Second Phase
Interaction-> Mass Tab->Mechanism->Evaporation-condensatio
Interaction-> Surface Tension Tab ->Surface Tension Force Modeling->ON

Boundary Conditions: inlet (Phase=mixture)->Edit->Momentum Tab-> Velocity Magnitude(m/s)=0,5
inlet (Phase=water-liquid)->Edit->Multiphase Tab->Volume Fraction=1
Wall (Phase=wŠter-liquid)->Edit->Thermal Tab->Temperature (k)=373

Solution Methods: Pressure-Velocity Coupling->SIMPLE
Spatial Discretization->Gradiet->Least Squares Cell Based
Spatial Discretization->Pressure->PRESTO!
Spatial Discretization->Momentum->QUICK
Spatial Discretization->Volumen Fraction-> QUICK
Spatial Discretization->Energy-> QUICK

Solution Initialization: Standard

Patch:Phase->Mixture
Variable->Temperature
Value(K)->1
Zones to Patch->Fluid_air & Fluid_water

Run:Time Step Size(s)->1e-05
Number of Time Steps->1000
Hello.
I have a a similar case although if you could name it! because mine has high speed and pressure also! so the effects of gravity can be neglected . and I'm not professional. but as I know VOF model works in the cases which you are more interested in free surface like open channel and... am I right? maybe it could help me! I use mixture model instead. also, my case is a steady one.

have you progressed in your case?

I have some problems especially with continuity! because the inlet and outlet not only are not the same but also have different order! and it makes me disappointed! I'm working on it. have you any idea?

anything which might help will be appreciated.

thanks. ali
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Old   April 8, 2014, 13:35
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Hello Ali

Neither am I an expert =)

Unfortunately, I have any result from the simulation.

I don't know what multiphase model is better for your case. I'm trying with VOF but if I can't run with VOF, I would to change to Mixture or Euler.

I dont Know but if you could to get that the inlet and the outlet have the same order, the problem could be easier, I think

Regards
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