[Yr0gErG]

Hi FLUENT users, I am trying to model natural convection in a closed car cabin with radiation. Below is the summary of my solution. But the temperature and velocity distributions do not seem to make sense, and the mass flow rate between two arbitrary planes steadily increases with more iterations. Please give me your valuable advise, please!

I would be glad to answer any questions.

FLUENT
Version: 3d, dp, pbns, rngke (3d, double precision, pressure-based, RNG k-epsilon)
Release: 6.3.26
Title:

Models
------

Model Settings
-----------------------------------------------------------------
Space 3D
Time Steady
Viscous RNG k-epsilon turbulence model
Wall Treatment Standard Wall Functions
RNG Differential Viscosity Model Disabled
RNG Swirl Dominated Flow Option Disabled
Heat Transfer Enabled
Solidification and Melting Disabled
Radiation None
Species Transport Disabled
Coupled Dispersed Phase Disabled
Pollutants Disabled
Pollutants Disabled
Soot Disabled

Boundary Conditions
-------------------

Zones

name id type
--------------------------------
air 2 fluid
outlet 3 wall
bottomhalf 4 wall
tophalf 5 wall
rearwindscreen 6 wall
frontwindscreen 7 wall
default-interior 9 interior

Boundary Conditions

air

Condition Value
------------------------------------------------------------------
Material Name air
Specify source terms? no
Source Terms ()
Specify fixed values? no
Local Coordinate System for Fixed Velocities no
Fixed Values ()
Motion Type 0
X-Velocity Of Zone (m/s) 0
Y-Velocity Of Zone (m/s) 0
Z-Velocity Of Zone (m/s) 0
Rotation speed (rad/s) 0
X-Origin of Rotation-Axis (m) 0
Y-Origin of Rotation-Axis (m) 0
Z-Origin of Rotation-Axis (m) 0
X-Component of Rotation-Axis 0
Y-Component of Rotation-Axis 0
Z-Component of Rotation-Axis 1
Deactivated Thread no
Laminar zone? no
Set Turbulent Viscosity to zero within laminar zone? yes
Porous zone? no
Conical porous zone? no
X-Component of Direction-1 Vector 1
Y-Component of Direction-1 Vector 0
Z-Component of Direction-1 Vector 0
X-Component of Direction-2 Vector 0
Y-Component of Direction-2 Vector 1
Z-Component of Direction-2 Vector 0
X-Component of Cone Axis Vector 1
Y-Component of Cone Axis Vector 0
Z-Component of Cone Axis Vector 0
X-Coordinate of Point on Cone Axis (m) 1
Y-Coordinate of Point on Cone Axis (m) 0
Z-Coordinate of Point on Cone Axis (m) 0
Half Angle of Cone Relative to its Axis (deg) 0
Relative Velocity Resistance Formulation? yes
Direction-1 Viscous Resistance (1/m2) 0
Direction-2 Viscous Resistance (1/m2) 0
Direction-3 Viscous Resistance (1/m2) 0
Choose alternative formulation for inertial resistance? no
Direction-1 Inertial Resistance (1/m) 0
Direction-2 Inertial Resistance (1/m) 0
Direction-3 Inertial Resistance (1/m) 0
C0 Coefficient for Power-Law 0
C1 Coefficient for Power-Law 0
Porosity 1
Solid Material Name aluminum

outlet


Condition Value
-------------------------------------------------------------
Wall Thickness (m) 0
Heat Generation Rate (w/m3) 0
Material Name aluminum
Thermal BC Type 1
Temperature (k) 300
Heat Flux (w/m2) 0
Convective Heat Transfer Coefficient (w/m2-k) 20
Free Stream Temperature (k) 300
Enable shell conduction? no
Wall Motion 0
Shear Boundary Condition 0
Define wall motion relative to adjacent cell zone? yes
Apply a rotational velocity to this wall? no
Velocity Magnitude (m/s) 0
X-Component of Wall Translation 1
Y-Component of Wall Translation 0
Z-Component of Wall Translation 0
Define wall velocity components? no
X-Component of Wall Translation (m/s) 0
Y-Component of Wall Translation (m/s) 0
Z-Component of Wall Translation (m/s) 0
External Emissivity 1
External Radiation Temperature (k) 300
Wall Roughness Height (m) 0
Wall Roughness Constant 0.5
Rotation Speed (rad/s) 0
X-Position of Rotation-Axis Origin (m) 0
Y-Position of Rotation-Axis Origin (m) 0
Z-Position of Rotation-Axis Origin (m) 0
X-Component of Rotation-Axis Direction 0
Y-Component of Rotation-Axis Direction 0
Z-Component of Rotation-Axis Direction 1
X-component of shear stress (pascal) 0
Y-component of shear stress (pascal) 0
Z-component of shear stress (pascal) 0
Surface tension gradient (n/m-k) 0
Specularity Coefficient 0

bottomhalf


Condition Value
-------------------------------------------------------------
Wall Thickness (m) 0
Heat Generation Rate (w/m3) 0
Material Name aluminum
Thermal BC Type 2
Temperature (k) 300
Heat Flux (w/m2) 0
Convective Heat Transfer Coefficient (w/m2-k) 20
Free Stream Temperature (k) 300
Enable shell conduction? no
Wall Motion 0
Shear Boundary Condition 0
Define wall motion relative to adjacent cell zone? yes
Apply a rotational velocity to this wall? no
Velocity Magnitude (m/s) 0
X-Component of Wall Translation 1
Y-Component of Wall Translation 0
Z-Component of Wall Translation 0
Define wall velocity components? no
X-Component of Wall Translation (m/s) 0
Y-Component of Wall Translation (m/s) 0
Z-Component of Wall Translation (m/s) 0
External Emissivity 1
External Radiation Temperature (k) 300
Wall Roughness Height (m) 0
Wall Roughness Constant 0.5
Rotation Speed (rad/s) 0
X-Position of Rotation-Axis Origin (m) 0
Y-Position of Rotation-Axis Origin (m) 0
Z-Position of Rotation-Axis Origin (m) 0
X-Component of Rotation-Axis Direction 0
Y-Component of Rotation-Axis Direction 0
Z-Component of Rotation-Axis Direction 1
X-component of shear stress (pascal) 0
Y-component of shear stress (pascal) 0
Z-component of shear stress (pascal) 0
Surface tension gradient (n/m-k) 0
Specularity Coefficient 0

tophalf


Condition Value
-------------------------------------------------------------
Wall Thickness (m) 0
Heat Generation Rate (w/m3) 0
Material Name aluminum
Thermal BC Type 2
Temperature (k) 300
Heat Flux (w/m2) 0
Convective Heat Transfer Coefficient (w/m2-k) 20
Free Stream Temperature (k) 300
Enable shell conduction? no
Wall Motion 0
Shear Boundary Condition 0
Define wall motion relative to adjacent cell zone? yes
Apply a rotational velocity to this wall? no
Velocity Magnitude (m/s) 0
X-Component of Wall Translation 1
Y-Component of Wall Translation 0
Z-Component of Wall Translation 0
Define wall velocity components? no
X-Component of Wall Translation (m/s) 0
Y-Component of Wall Translation (m/s) 0
Z-Component of Wall Translation (m/s) 0
External Emissivity 1
External Radiation Temperature (k) 300
Wall Roughness Height (m) 0
Wall Roughness Constant 0.5
Rotation Speed (rad/s) 0
X-Position of Rotation-Axis Origin (m) 0
Y-Position of Rotation-Axis Origin (m) 0
Z-Position of Rotation-Axis Origin (m) 0
X-Component of Rotation-Axis Direction 0
Y-Component of Rotation-Axis Direction 0
Z-Component of Rotation-Axis Direction 1
X-component of shear stress (pascal) 0
Y-component of shear stress (pascal) 0
Z-component of shear stress (pascal) 0
Surface tension gradient (n/m-k) 0
Specularity Coefficient 0

rearwindscreen


Condition Value
-------------------------------------------------------------
Wall Thickness (m) 0
Heat Generation Rate (w/m3) 0
Material Name aluminum
Thermal BC Type 4
Temperature (k) 300
Heat Flux (w/m2) 0
Convective Heat Transfer Coefficient (w/m2-k) 0
Free Stream Temperature (k) 300
Enable shell conduction? no
Wall Motion 0
Shear Boundary Condition 0
Define wall motion relative to adjacent cell zone? yes
Apply a rotational velocity to this wall? no
Velocity Magnitude (m/s) 0
X-Component of Wall Translation 1
Y-Component of Wall Translation 0
Z-Component of Wall Translation 0
Define wall velocity components? no
X-Component of Wall Translation (m/s) 0
Y-Component of Wall Translation (m/s) 0
Z-Component of Wall Translation (m/s) 0
External Emissivity 1
External Radiation Temperature (k) 340
Wall Roughness Height (m) 0
Wall Roughness Constant 0.5
Rotation Speed (rad/s) 0
X-Position of Rotation-Axis Origin (m) 0
Y-Position of Rotation-Axis Origin (m) 0
Z-Position of Rotation-Axis Origin (m) 0
X-Component of Rotation-Axis Direction 0
Y-Component of Rotation-Axis Direction 0
Z-Component of Rotation-Axis Direction 1
X-component of shear stress (pascal) 0
Y-component of shear stress (pascal) 0
Z-component of shear stress (pascal) 0
Surface tension gradient (n/m-k) 0
Specularity Coefficient 0