Droplet Collapse on a Wall with/without Shear Stress, Ansys Fluent Training
$106.00 Student Discount
In this project, the water droplet collapse on the wall with/without shear stress has been simulated and the results of this simulation have been investigated.
This product includes Geometry & Mesh file and a comprehensive Training Movie.
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Description
Project Description
In this project, Ansys Fluent software has been used for numerical simulation of water droplet collapse on the wall in two modes of non-slip condition and shear stress condition. The VOF model has been used to simulate and solve the two-phase flow field equations.
Geometry & Mesh
The 2-D geometry of the present model is generated using Spaceclaim software. The length of the computational area is 25 mm and its height is 12.5 mm.
The meshing of the present model has been done using Ansys Meshing software. The mesh type is unstructured in all of the computational domains, and the element number is equal to 53440.
Droplet Motion CFD Simulation Settings
We consider several assumptions to simulate the present model:
- Due to the incompressibility of the flow, the pressure-based solver method has been selected.
- The simulation is transient.
- The gravity effect is considered equal to -9.81 m.s-2 on Y-axis
 The Laminar viscous model has been used to solve the flow field equations, and the pressure-velocity coupling scheme is SIMPLE. The second-order upwind discretization method has been used for momentum and PRESTO! For the pressure discretization.
The following tables represent a summary of the defining steps of the problem in this project and its solution:
| Models | ||
| Multiphase | ||
| Homogeneous model | Volume of fluid | |
| Number of Eulerian phases | 2(air& water) | |
| Interface modeling | Sharp
Interfacial |
|
| Formulation | explicit | |
| Body force formulation | Implicit body force | |
| Viscous | Laminar | |
| Material Properties | |
| Â Air | |
| Density | 1.225 |
| viscosity | 1.7894e-05 |
| water-liquid | |
| Density | 998.2 |
| viscosity | 0.001003 |
| Methods | ||
| Pressure-Velocity Coupling | SIMPLE | |
| Â | Pressure | PRESTO! |
| Â | Momentum | Second-order upwind |
| Volume fraction | Compressive | |
| Initialization | ||
| Initialization methods | Standard | |
| Patch | Phase | Phase2 |
| Â | Variable | Volume Fraction |
| Registers to patch | Region_0 | |
| Value | 1 | |
| Run calculation | ||
| Time advancement | Type | adaptive |
| Parameters | ||
| Initial time step size | 0.0003 | |
| Settings | Minimum time step size | 0.0003 |
| Maximum time step size | 0.0003 | |
| Time step size | 180 | |
Droplet Motion Results
In this simulation, the free surface of the water droplet is investigated in two modes. The drop is primarily crushed, and the surface’s rate of dispersion and wetting has increased, which intuitively we expect the same behavior from the movement of the fluid in the presence of slip.
You can obtain Geometry & Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.[/vc_column_text]
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Anna B. –
The “Minimum time step size” and the “Maximum time step size” are the same. So why did you use adaptive time advancement?