Design and Analysis of Industrial Ball Valve using Computational Fluid Dynamics
Computational Fluid Dynamic analysis is carried out to establish a robust affiliation between the design variables of material design domain and product design domain. The CFD analyses performed for both ball valve and gate valve is necessitated with input parameters that outfits the application such as pressure, density, viscosity and temperature. The maximum pressure acting over diverse regions of the valve system that crop up due to fluid flow was examined by the extension of pressure concentration for different fluids viz. water, lubricant and diesel. The analysis is presumed to be conversant with material selection strategies that satisfy the criterions for the new product development and therefore well defined inputs inclusive of virtual solid model, boundary conditions are promoted with higher grade mesh resolutions. In these cases, approximate selections are exercised and numerical scheme of properties has been adhered to embrace perfection in simulation analysis. The CFD study exemplifies accurate regions wherein maximum pressure assaults the valve body and so the observations originate to ascend product development without the expense of physical testing. The verification studies put forth for the pressure distribution generated due to fluid flow through the valve system is in stripe with end results. Furthermore valve deformation and valve performance is obligatory for material and product design integration and hence customary predictions is done by coupling the CFD results with finite element analysis.
In CFD analysis the pressure distribution across the required area is analyzed by gratifying the boundary condition applied. In order to perform the design, optimization and the analysis of the valve performance, for a particular application dynamic fluid analysis is performed on two types of valve viz. stem valve and ball valve. Valve body is chosen for generating relation between type of fluid flow, geometry and pressure loses using CFD, since they have a simple mechanical construction, utmost exposure during fluid flow, attains critical deformation, and more importantly, give a low head loss. CFD analysis is capable to reveal the complex flow structure and the sonic characteristics around the valve, which the experiments hardly ever provide. Even otherwise, experimentation needs to be supplemented with CFD analysis because of intricate geometry as well as complexities like turbulence during the sonic flow through a valve.
Computational fluid dynamics (CFD) is the science of determining a numerical solution to the governing equations of fluid flow whilst advancing the solution through space or time to obtain a numerical description of the complete flow field of interest. The various steps involved in solving a flow problem in CFD approach involve the following basic steps
COMPUTATIONAL FLUID DYNAMICS
• Defining the geometry of the problem (i.e. the physical boundary)
• Meshing the volume occupied by the fluid into discrete cells.
• Physical modeling of the problem (i.e. the governing equations)
• Defining the boundary conditions
• Solving the governing equations iteratively either as a steady state or as a unsteady state
• Post processing (i.e. analysis and visualization of the results)