Dear Amine,
Thanks for your hint.
The 3D model now consists of a nozzle at a fixed distance above a substrate. The substrate is moving in one direction to model the slurry deposition during printing. To test the model, the slurry now just has a fixed viscosity of 1 pas/s, this will later be changed to a non Newtonian viscosity.
As a time step I use a function that changes the time step per iteration: IF(iter<=600, 1 *10**-(10-iter*0.01), 0.0001 ) with a total of 1700 iterations.
Down here I put the text I wrote the settings of the 3d model (the same as in the attachments).
Fluent
Version: 3d, dp, pbns, vof, lam, transient (3d, double precision, pressure-based, VOF, laminar, transient)
Release: 20.1.0
Title:
Models
Model Settings
Space 3D
Time Unsteady, 1st-Order Implicit
Viscous Laminar
Heat Transfer Disabled
Solidification and Melting Disabled
Species Disabled
Coupled Dispersed Phase Disabled
NOx Pollutants Disabled
SOx Pollutants Disabled
Soot Disabled
Mercury Pollutants Disabled
Structure Disabled
Material Properties
Material: slurry (fluid)
Property Units Method Value(s)
Density kg/m3 constant 7260
Cp (Specific Heat) j/kg-k constant 1006.43
Thermal Conductivity w/m-k constant 0.0242
Viscosity kg/m-s constant 1
Molecular Weight kg/kmol constant 28.966
Thermal Expansion Coefficient 1/k constant 0
Speed of Sound m/s none #f
Material: air (fluid)
Property Units Method Value(s)
Density kg/m3 constant 1.225
Cp (Specific Heat) j/kg-k constant 1006.43
Thermal Conductivity w/m-k constant 0.0242
Viscosity kg/m-s constant 1.7894e-05
Molecular Weight kg/kmol constant 28.966
Thermal Expansion Coefficient 1/k constant 0
Speed of Sound m/s none #f
Material: aluminium (solid)
Property Units Method Value(s)
Density kg/m3 constant 2719
Cp (Specific Heat) j/kg-k constant 871
Thermal Conductivity w/m-k constant 202.4
Cell Zone Conditions
Zones
name id type
fluid 3 fluid
Setup Conditions
fluid
Condition Value
Frame Motion? no
Mesh Motion? no
Boundary Conditions
Zones
name id type
wall-fluid 1 wall
symmetry-plane 6 symmetry
pressure-outlet 7 pressure-outlet
moving-wall 8 wall
velocity-inlet 9 velocity-inlet
Setup Conditions
wall-fluid
Condition Value
Wall Motion 0
Shear Boundary Condition 0
Contact Angles (((constant . 2.0943948) (profile )))
symmetry-plane
Condition Value
pressure-outlet
Condition Value
moving-wall
Condition Value
Wall Motion 1
Shear Boundary Condition 0
Define wall motion relative to adjacent cell zone? yes
Velocity Magnitude (m/s) 0.01
Contact Angles (((constant . 1.5707963) (profile )))
velocity-inlet
Condition Value
Velocity Magnitude (m/s) 0.01
Solver Settings
Equations
Equation Solved
Flow yes
Volume Fraction yes
Numerics
Numeric Enabled
Absolute Velocity Formulation yes
Unsteady Calculation Parameters
Time Step (s) 2.5118864e-09
Max. Iterations Per Time Step 20
Non-Iterative Solver Factors
Variable Max. Corrections Correction Tolerance Residual Tolerance Relaxation Factor
Pressure 10 0.25 0.0001 1
Momentum 5 0.05 0.0001 1
Volume Fraction 5 0.05 0.0001 1
Linear Solver
Variable Solver Type Termination Criterion Residual Reduction Tolerance
Pressure F-Cycle 0.1
X-Momentum Flexible 0.1 0.7
Y-Momentum Flexible 0.1 0.7
Z-Momentum Flexible 0.1 0.7
Volume Fraction Flexible 0.1 0.7
Pressure-Velocity Coupling
Parameter Value
Type Fractional Step
Discretization Scheme
Variable Scheme
Pressure PRESTO!
Momentum QUICK
Volume Fraction Compressive
Solution Limits
Quantity Limit
Minimum Absolute Pressure 1
Maximum Absolute Pressure 5e+10
Minimum Temperature 1
Maximum Temperature 5000
I hope you now have a general idea of the problem and that you can help me further.
Sincerely,
Guus van Wezel
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