(2)寻求高效率、高精确度的计算办法，即树立针对控制方程的数值离散化办法，如有限差分法、有限元法，有限体积法等，包括微分方程的离散化办法及求解办法，还包括贴体坐标系的树立、边境条件的处置等。
随着计算机技术和数值办法的开展，目前曾经有许多专业的商用软件，如FLUENT、PHOENICS.CFX和STAR. CD等,对活动停止数值模仿不需求再逐一完成以上每一步 .主要的工作是依据研讨问题，选择对应的数学模型和边境条件，详细的离散和求解选择软件中提供的办法即可，主要的精神和时间花在计算网格划分和计算结果的显现上。
关于离心泵类旋转机械,采用商业软件停止CFD数值模仿时还需求思索的问题主要为:树立计算域模型，生成计算网格，设置动静区域耦合计算办法，选择湍流模型,给定边境条件及计算结果处置等。
AF foam pump flow range parameter
It has the advantages of less research cost and short cycle. At present, CFD technology has been widely used in the early development of pump products to predict their performance, provide complete three-dimensional flow field effect for R & D personnel, and provide important reference for improving design.
CFD numerical simulation of flow usually includes the following steps:
(1) Establish a mathematical model that reflects the essence of engineering problems or physical problems, that is, establish differential or integral equations and corresponding definite solution conditions that reflect the relationship between various quantities of the problem.
(2) Seek efficient and accurate calculation methods, that is, establish numerical discretization methods for control equations, such as finite difference method, finite element method, finite volume method, etc., including discretization method and solution method of differential equations, establishment of body fitted coordinate system, treatment of boundary conditions, etc.
(3) Program and calculate. It includes mesh generation, input of initial and boundary conditions, setting of control parameters, programming of solver module, etc.
(4) Display of calculation results. For complex flow field, the huge data file obtained by calculation can not be directly used as the final result, and the calculation results need to be displayed by charts and images.
With the development of computer technology and numerical methods, there are many professional commercial software, such as fluent, phoenix.cfx and star. CD. It is not necessary to complete each of the above steps for numerical simulation of flow one by one. The main work is to select the corresponding mathematical model and boundary conditions according to the research problems, and select the specific discretization and solution methods provided in the software, The main energy and time are spent on computational meshing and the display of computational results.
For centrifugal pump rotating machinery, the main problems to be considered when using commercial software for CFD numerical simulation are: establishing calculation domain model, generating calculation grid, setting dynamic and static region coupling calculation method, selecting turbulence model, giving boundary conditions and processing of calculation results, etc.
