Purpose. This paper aims to develop a multidomain boundary element method (BEM) for modeling 2D complex turbulent thermal flow using low Reynolds two-equation turbulence models. Findings. The simulation of a turbulent flow over a backward step is in excellent agreement with the finite volume method using the same turbulent model. A grid consisting of over 100,000 elements could be solved in the order of a few minutes using a 3.0 GHz P4 and 1 GB memory indicating good efficiency.
COBISS.SI-ID: 12301846
This paper discusses the influence of biodiesel on the injection, spray, and engine characteristics with the aim to reduce harmful emissions. The considered engine is a bus diesel engine with injection M system. The injection, fuel spray, and engine characteristics, obtained with biodiesel, are compared to those obtained with mineral diesel under various operating regimes. The considered fuel is neat biodiesel from rapeseed oil. The obtained results are used to analyze the most important injection, fuel spray, and engine characteristics.
COBISS.SI-ID: 11164694
The development of boundary element method BEM for computation of fluid flow is predominantly focused on the flow of incompressible fluid. This assumption provides a good approximation for a wide variety of engineering applications, but to achieve a better representation of physical phenomena, a compressible fluid flow must be taken into account. The goal of the contribution is to give an in depth explanation for the transformation of Navier-Strokes equations for compressible fluid into its velocity-varticity formulation equivalent. In addition, the pressure equation for the velocity-vorcity f
COBISS.SI-ID: 11420694
The scientific work deals with first successful attempt of development of Boundary Element Method for numerical simulation of turbulent fluid flow by means of the Large Eddy Simulation (LES). Velocity-vorticity formulation is developed of the filtered Navier-Stokes equations, presenting the basis for the LES computational algorithm. The computational algorithm is based on an innovative combination of boundary element method, used in computing flow kinematics, and finite element method, used in computing flow kinetics. The derived numerical algorithm can be extended to three-dimensional flows,
COBISS.SI-ID: 10549782
The incompressible non-Newtonian fluid flow through a symmetric sudden expansion has been studied numerically in order to obtain the critical value of Reynolds number. Well known Power law and at the institute developed Quadratic model were employed to describe the shear thickening viscous behaviour. Numerical results show that the shear thickening viscous behaviour of a fluid lowers the threshold of the transition from flow symmetry to its asymmetry and shifts the occurrence of the third vortex towards lower value of generalized Reynolds number. The paper was the most downloaded paper from t
COBISS.SI-ID: 10390294