What is the flow of the Modelling in Comsol?
All turbulence models can be combined with the phase field and level set methods for two-phase flow in COMSOL Multiphysics. Two-phase flow with water and air in a reactor modeled using the level set method in combination with the k-e turbulence model.
Can Comsol do CFD?
The CFD Module, an add-on to COMSOL Multiphysics, is a powerful tool that enables users to carry out these simulations for a variety of fluid flow. These include laminar and creeping flow, non-Newtonian flow, turbulent flow, two-phase flow, thin film flow, and rotating machinery.
How do you make a model on Comsol?
There are four main ways you can generate the geometry for your simulation in COMSOL Multiphysics:
- Draw the geometry within the COMSOL® software.
- Import an external CAD file.
- Use one of the LiveLink™ products.
- Import mesh data from an external file.
What is level set method in Comsol?
The level set method is a technique to represent moving interfaces or boundaries using a fixed mesh. It is useful for problems where the computational domain can be divided into two domains separated by an interface. Each of the two domains can consist of several parts.
What is wetted wall in Comsol?
The Wetted Wall boundary condition is suitable for walls in contact with the fluid-fluid interface. When this boundary condition is used, the fluid-fluid interface can move along the wall.
What is level set method in CFD?
Level-set methods (LSM) are a conceptual framework for using level sets as a tool for numerical analysis of surfaces and shapes.
How to model two-phase flow without topology changes?
If you want to model two-phase flow that does not involve any topology changes, that is, no droplet breakup, free surface formation, etc… and if the free surface does not undergo significant shape changes, you may be able to use the Laminar Two Phase Flow, Moving Mesh interface available with the Microfluidics Module only.
How do I model this in COMSOL Multiphysics?
To model this in COMSOL Multiphysics, we can use either the Level Set or the Phase Field methods. Both of these methods introduce an additional scalar field (the level set or phase field function) to the modeling domain.
What is the level set/phase field model parameter?
When using either the Level Set or Phase Field interfaces, there is a Level Set/Phase Field Model feature which is used to define the Parameter controlling interface thickness. If this value is too small, it can lead to numerical instabilities and if it is too large, the interface movement is not captured correctly.
What are the governing equations for the level set and phase field?
The governing equations for the Level Set and Phase Field methods are a type of Convection-Diffusion equation, with the advective term coming from the Navier-Stokes equations.