Multi-Physics Code (MɸC)
The Multi-Physics Code is an in-house development of the CFD Laboratory. The main aim of the development is the creation of a general computational framework which can be used to conduct complex multi-physics simulation of a wide range of (aerospace) applications. To achieve this the framework is set up such that different mathematical flow models corresponding to different levels of physical fidelity and detail can be combined into a single simulation, i.e. in different parts of the flow domain different models can be used depending on the nature of the flow. Using a range of coupling techniques, the flow solution in the different regions are coupled and general and efficient computational techniques have been developed to exchange the information in large-scale parallel simulations. It was created as a library of C++ template classes designed such that for a wide range of numerical methods, the commonaltity in the various algorithms is used using the approach of generic programming in C++, e.g. for message-passing operations required in CFD simulations baseed on the paradigm of domain decomposition, a range of template classes have been developed that can be specialised subsequently for a range of mesh-based as well as particle based numerical methods. Similarly, base template classes are available for other parts of different algorithm, such as class for link-cell type particle-based simulation methods. In addition to these generic C++ template classes, a number of numerical methods as presently available:
- Finite-volume continuum-flow solver for block-structured mesh - the AUSM+/up numerical flux method has been implemented to give an 'all-Mach' capability - for more information see publication [1]
-Finite-volume discrete-velocity method for kinetic Boltzmann equations for multi-block structured meshes - a range of kinetic models has been implemented: mono- and diatomic Ellipsoidal Statistical (ES), the Shakhov-BGK as well as the Rykov model for diatomic gas flows
- Gas Kinetic Schemes. Based on the Shakhov and Rykov kinetic models Gas Kinetic schemes are being development with the Multi-Physics Code at the present time
- Molecular Dynamics (MD) method with spatial decomposition for parallel simulations. In the present framework the MD solver is typically employed to either provide a more accurate flow solution in selected parts of the flow domain where it replaces the Navier-Stokes method (see publication [2]) or it is used to providemore accurate transport properties in flows with localised non-continuum or non-Newtonian behaviour within the context of a finite-volume Navier-Stokes based simulation (see publication [3])
- Vortex Particle simulation. Based on the generic template classes for particle methods, a Vortex-In-Cell type of solver was also contructed with the aim to accurately capture and resolve incompressible vortex-dominated flows
Further development of different methods and algorithms in the Multi-Physics Code is underway in the CFD Laboratory.
For further information. please contact: Dr. R. Steijl