ANSYS FLUENT TRAINING: Golf ball Aerodynamics, CFD Simulation by ANSYS Fluent
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In this project, a golf ball is studied aerodynamically, at speed with lateral angle and zero degree angle of attack using ANSYS Fluent software. The intended speed is 94 meters per second.
Introduction
In the dynamic simulation, quasi-experimental aerodynamic coefficients are used. These coefficients are obtained by quasi-experimental software. The coefficients obtained in these softwares have many errors. To achieve more accurate coefficients, numerical simulation by computational fluid dynamics is used, and the coefficients obtained by semi-experimental simulation software are calibrated using CFD coefficients. In this research, the calculation of aerodynamic coefficients has been done using numerical simulations and Fluent commercial software.
Golf Ball Geometry & Mesh
In this section, the geometry of the golf ball and the net on it are examined.
Golf
One of the most influential and time-consuming steps in numerical simulations, is grid generation. The better mesh quality, make other solving steps to proceed more accurately.
Due to the dimensions of the problem and the car’s geometry, the prism grid has been used for the boundary layer, and the unstructured grid has been used for other parts of the solution domain. To generate a mesh in ICEM software, you must first determine the size of the mesh elements in different parts according to the dimensions of the problem and the type of flow and geometry of the object under study.
Various methods have been proposed to create an unstructured mesh in ICEM software. This software has two top-down and bottom-up methods for generating a UNS mesh. Below, we introduce these two methods.
To create a suitable mesh, the combined (hybrid) method is used so that the whole solution domain, including surfaces and lines, is meshed with the help of the Octree method. Then with the help of the Delauney method and with the help of the existing mesh, a smooth mesh is created in the whole solution domain.
The following figure shows the grid on the middle page:
golf ball
The mesh is fragmented in parts of the geometry where the radius changes abruptly, and on the fractures and dimples, it is larger in other areas.
Solution Settings
We investigate the issue numerically, using Fluent commercial software, and solve this problem in Steady mode using the pressure-base method. Also, we use Fluent software to solve the governing equations numerically. In this chapter, we consider flow conditions, type of boundaries, type of solvent, and flow discretization methods..
Fluid Properties
In this research, the fluid is air. The following table shows the air properties extracted from the Fluent software database, given that the current is in an incompressible regime and its density is constant.
Amount (units) Fluid Properties(air)
1006.43 (J/kg.k) Thermal pressure coeffiecent
0.0242(w/m.k) Thermal conductivity
Boundary Conditions (Golf Ball)
One of the most influential variables in the numerical solution process is boundary conditions. For this purpose, we use different boundary conditions in the computational range. We introduce these conditions as:.