Download - Comsol heat sink, Hexagonal Fin Study
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Work flow in the COMSOL Multiphysics
After completion of modelling the geometries of the heat sinks, a quantitative study is carried out; and it follows as:
Material describing Boundary conditions defining Meshing Solving and Post processing.
Material describing:
For both the heat sinks, the working conditions and material properties and domain properties are similar. And they are as follows:
Material parameters
Name Value Unit
Dynamic viscosity eta(T[1/K])[Pa*s] Pa*s
Ratio of specific heats 1.4 1
Heat capacity at constant pressure Cp(T[1/K])[J/(kg*K)] J/(kg*K)
Density rho(pA[1/Pa], T[1/K])[kg/m^3] kg/m^3
Thermal conductivity k(T[1/K])[W/(m*K)] W/(m*K)
Aluminium 3003-H18 (for Heat sinks)
Name Value Unit
Heat capacity at constant pressure 893[J/(kg*K)] J/(kg*K)
Density 2730[kg/m^3] kg/m^3
Thermal conductivity 155[W/(m*K)] W/(m*K)
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Aluminium 3003-H18 heat sink (hexagonal fins)
Young’s modulus and Poisson’s ratio settings
Description Value
Young's modulus 69e9[Pa]
Poisson's ratio 0.33
Heat Transfer in Solids 1
Heat Transfer in Solids 1
SELECTION
Geometric entity level Domain
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Selection Domains 2–11
Equations
PROPERTIES FROM MATERIAL
Property Material Property group
Thermal conductivity Aluminum 3003 - H18 Basic
Density Aluminum 3003 - H18 Basic
Heat capacity at constant pressure Aluminum 3003 - H18 Basic
Boundary Conditions Defining
Thermal Insulation 1
Thermal Insulation 1
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SELECTION
Geometric entity level Boundary
Selection Boundaries 2–5, 8
Equations
Wall 1
Wall 1
SELECTION
Geometric entity level
Boundary
SelectionBoundaries 2–7, 9–12, 14–16, 18–20, 22–36, 38–40, 42–44, 46–60, 62–64, 66–68, 70–83
Equations
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Initial Values 1
Initial Values 1
SELECTION
Geometric entity level
Domain
Selection Domains 1–11
Fluid 1
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Fluid 1
SELECTION
Geometric entity level Domain
Selection Domain 1
Equations
PROPERTIES FROM MATERIAL
Property Material Property group
Density Air Basic
Dynamic viscosity Air Basic
Thermal conductivity Air Basic
Heat capacity at constant pressure Air Basic
Ratio of specific heats Air Basic
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Heat Source 1
Heat Source 1
SELECTION
Geometric entity level Domain
Selection Domain 2
Equations
SETTINGS
Description Value
Heat source Total power
Total power 1
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Inlet 1
Inlet 1
SELECTION
Geometric entity level Boundary
Selection Boundary 84
Equations
SETTINGS
Description Value
Boundary condition Laminar inflow
Average velocity 5[cm/s]
Outlet 1
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Outlet 1
SELECTION
Geometric entity level
Boundary
Selection Boundary 1
Equations
Temperature 1
Temperature 1
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SELECTION
Geometric entity level Boundary
Selection Boundary 84
Equations
SETTINGS
Description Value
Temperature 20[degC]
Outflow 1
Outflow 1
SELECTION
Geometric entity level
Boundary
Selection Boundary 1
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Equations
MESH 1
Mesh 1
Size (Size)
SETTINGS
Name Value
Maximum element size 0.0080
Minimum element size 0.00144
Resolution of curvature 0.6
Resolution of narrow regions 0.5
Maximum element growth rate 1.5
SOLVER CONFIGURATIONS
Compile Equations: Stationary (St1)
STUDY AND STEP
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Name Value
Use study Study 1
Use study step Stationary
Dependent Variables 1 (V1)
GENERAL
Name Value
Defined by study step
Stationary
INITIAL VALUES OF VARIABLES SOLVED FOR
Name Value
Solution Zero
VALUES OF VARIABLES NOT SOLVED FOR
Name Value
Solution Zero
Mod1.u (Mod1_u)
GENERAL
Name Value
Field components {mod1.u, mod1.v, mod1.w}
Mod1.T (Mod1_T)
GENERAL
Name Value
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Field components mod1.T
Mod1.p (Mod1_p)
GENERAL
Name Value
Field components mod1.p
Mod1.nitf.Pinlinl1 (Mod1_nitf_Pinlinl1)
GENERAL
Name Value
State components
mod1.nitf.Pinlinl1
Stationary Solver 1 (S1)
GENERAL
Name Value
Defined by study step
Stationary
Fully Coupled 1 (Fc1)
GENERAL
Name Value
Linear solver
Iterative 1
METHOD AND TERMINATION
Name Value
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Nonlinear method
Constant (Newton)
Damping factor 0.8
Iterative 1 (I1)
ERROR
Name Value
Factor in error estimate 20
Maximum number of iterations 200
Nonlinear based error norm On
Multigrid 1 (Mg1)
Presmoother (Pr)
Vanka 1 (Va1)
MAIN
Name Value
Number of iterations 1
Variables mod1.nitf.Pinlinl1
SECONDARY
Name Value
Relaxation factor
0.6
Postsmoother (Po)
Vanka 1 (Va1)
MAIN
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Name Value
Number of iterations 1
Variables mod1.nitf.Pinlinl1
SECONDARY
Name Value
Number of secondary iterations
2
Relaxation factor 0.7
Coarse Solver (Cs)
Direct 1 (D1)
GENERAL
Name Value
Solver PARDISO
Results
DATA SETS
Solution 1
SELECTION
Geometric entity level
Domain
Selection Geometry geom1
SOLUTION
Name Value
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Solution Solver 1
Model Save Point Geometry 1
Surface 1
SELECTION
Geometric entity level
Boundary
SelectionBoundaries 2–7, 9–12, 14–16, 18–20, 22–36, 38–40, 42–44, 46–60, 62–64, 66–68, 70–83
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SQUARE FIN ANALYSIS
Definitions
Coordinate Systems
Boundary System 1
Coordinate system type Boundary system
Identifier sys1
Geometry 1
Geometry 1
unitsLength unit m
Angular unit Deg
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Materials
Air
Air
SelectionGeometric entity level Domain
Selection Domain 1
Aluminum 3003-H18
Aluminum 3003-H18
SelectionGeometric entity level Domain
Selection Domains 2–11
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Conjugate Heat Transfer (nitf)
Conjugate Heat Transfer
FeaturesHeat Transfer in Solids 1
Thermal Insulation 1
Wall 1
Initial Values 1
Fluid 1
Heat Source 1
Inlet 1
Temperature 1
Outlet 1
Outflow 1
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Mesh 1
Mesh 1
STUDY
Stationary
Mesh selectionGeometry Mesh
Geometry 1 (geom1)
mesh1
Physics selectionPhysics Discretization
Conjugate Heat Transfer (nitf)
physics
RESULTS
Data Sets
Solution 1
SelectionGeometric entity level Domain
Selection Geometry geom1
SolutionName Value
Solution Solver 1
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Name Value
Model Save Point Geometry 1
Surface 1
SelectionGeometric entity level Boundary
Selection Boundaries 2–7, 9–12, 14–17, 19–22, 24–30, 32–35, 37–40, 42–48, 50–53, 55–58, 60–65
DataName Value
Data set Solution 1