Numerical Analysis of Flow in Building Arrangement: Computational Domain Discretization

Abstract

The progress in environmental investigations such as the analysis of building arrangements in an urban environment could not have been expanded without the use of computational fluid dynamics (CFD) as a research tool. The rapid development of numerical models results in improved correlations to results obtained with real data. Unfortunately, the computational domain discretization is a crucial step in CFD analysis which significantly influences the accuracy of the generated results. Hence an innovative approach to computational domain discretization using polyhedral elements is proposed. The results are compared to commonly applied tetrahedral and hexahedral elements as well as experimental results of particle image velocimetry (PIV). The performed research proves that the proposed method is promising as it allows for the reduction of both the numerical diffusion of the mesh as well as the time cost of preparing the model for calculation. In consequence, the presented approach allows for better results in less time.

Solving the Coupled Aerodynamic and Thermal Problem for Modeling the Air Distribution Devices with Perforated Plates

“…The proposed approach allows determining the parameters of the model by the experimental data. Particularly, formulas (6) and (17) allow determining the average velocity and hydraulic losses in the air distribution device using the regression dependencies (11) and (20) for evaluating the unknown parameters.…”

“…For determination of the rational design parameters of the air distribution device, the following five design models are proposed: (a) without directing elements inside the panel ( Figure 1a); (b) with a directing element as a perforated cone for improving the uniformity of the velocity field in the entire area of the panel ( Figure 1b); (c) with two directing elements as perforated cones of different diameters ( Figure 1c); (d) with a conical outlet with the angle 4 • (Figure 1d); (e) with a conical outlet and two directing elements as perforated cones of different diameters for improving the uniformity of the velocity field in the entire area of the panel (Figure 1e). A numerical experiment on the modeling of coupled aerodynamics and thermal analysis through the system of inflow ventilation was carried out using the "ANSYS CFX" software [16,17]. For this purpose, three-dimensional models of different designs were created using the "SolidWorks" software.…”

“…The transfer of thermodynamic parameters between the estimated grids occurs on the interface surface. A numerical experiment on the modeling of coupled aerodynamics and thermal analysis through the system of inflow ventilation was carried out using the "ANSYS CFX" software [16,17]. For this purpose, three-dimensional models of different designs were created using the "SolidWorks" software.…”

A Three-Dimensional Cartesian Mesh Generation Algorithm Based on the GPU Parallel Ray Casting Method

“…The block and thread are both logical structure in the GPU. ra y [1 ] ra y [2 ] ra y [3 ] ra y [4 ] .. .. ..…”

“…Cartesian mesh has been wildly used in computational fluid dynamics [1][2][3][4], computational explosion mechanics [5], and computer graphics such as collision detection [6,7]. Cartesian mesh is usually used as an approximate discretization for three-dimensional geometry.…”