Kiattisak Ngiamsoongnirn

National Metal and Materials Technology Center | MTEC · Computer Aided Engineering

The objective of the present work is to propose an extended analytical wall function that is capable of predicting the bypass transition from laminar to turbulent flow. The algebraic γ transition model, the k−ω turbulence model and the analytical wall function are integrated together in this work to detect the transition onset and start the transit...

The objective of this paper is to propose a new intermittency transport equation that is naturally capable of capturing the effects of free-stream turbulence and pressure gradient on bypass and natural transition without need for any extra parameters/terms to take into account the free-stream turbulence and the pressure gradient. This new intermitt...

The learning of Computer‐Aided Engineering (CAE) usually involves practical computer lessons on the use of CAE software. Software packages suitable for learning should be user‐friendly and accessible, with an affordable cost. However, the CAE freeware and proprietary software available in the market are relatively difficult to use for novices. Furt...

mpi; turbulent flow; parallel computation; backward-facing step

A new physics-based γ–kL transition model is proposed for the first time in this paper where γ is the intermittency and kL is the laminar kinetic energy. Unlike the correlation-based γ–Re model, the transport equations of the γ–kL model are constructed based on basic physical mechanisms and their interactions. The relationship among γ, kL and k en...

During the last decade, there have been two RANS-based transition models used in commercial CFD software: θ γ Re − model and L k model. The present work is aimed to combine the merit parts of both transition models. Apart from the base turbu-lence model, the transition model proposed here is composed of the original L k -equation and the new γ alge...

The development of CFD code with the use of parallel computing in conjunction with the multigrid and multiblock methods is presented for calculating an incompressible flow through a two-dimensional T-junction. The finite volume method (FVM) is used to discretize the governing equations of the steady laminar flow. The QUICK scheme is applied for the...

The multigrid method adopted in conjunction with the parallel computing is presented. The standard multigrid doubling the mesh size in all directions, called full-coarsening technique, suffers from the partitioning of data for parallel computing. To remedy this problem, the semicoarsening technique should be used instead. This work is aimed to pres...

This paper is aimed to present the combination of the parallel computing and the multigrid method on the Navier-Stokes solver. The combination is based on the concept of the object-oriented programming (OOP), which consists of 4 independent modules: Grid Generation, Navier-Stokes Solver, Multigrid Method and Parallel Computing modules. The multigri...