Dynamic Mesh Update Method for Calculation of Two-Dimensional Flow Field with Small Clearance of Moving Conical Spool

Abstract

The invention discloses a dynamic grid updating method for calculating a two-dimensional flow field with a small gap of a moving conical valve core. , perform structured meshing of the 2D model. (2) Use FLUENT software to establish the flow field transient calculation model of the front and rear flow channels of the conical valve core. The valve core will move linearly along the axis direction under the action of fluid force, friction force, spring force and gravity. (3) According to the dynamic theory, the motion equation of the valve core is established. (4) Carry out the two-dimensional transient flow field calculation in the FLUENT software, and calculate the fluid force acting on both ends of the valve core at each time step; (5) Before the transient calculation of the flow field for one time step starts, in the UDF Using the calculated fluid force acting on both ends of the valve core, and then according to the motion equation of the valve core, calculate the vibration displacement of the valve core in one time step; (6) According to the dynamic calculation results of (5), according to the given method, The moving distance of each grid node is calculated, and the coordinate values ​​of the grid nodes related to the fluid domain are updated, and the fluid domain changes accordingly.

Description

Technical field [0001] The present invention belongs to the technical field of computational fluid dynamics, particularly to a method for updating the movable grid tapered valve body of the relief valve flow field. Background technique [0002] Effect produced by the expansion pressure reducing valve when the fluid through a narrow cross section under reduced pressure, to adjust the flow and pressure of fluid through the valve opening degree of the valve element body, there is widely used in the fields of energy, chemicals and machinery. Especially with the large-scale promotion of hydrogen energy and other clean energy sources, in order to improve storage density per unit volume, storing high-pressure gas is also increasing, the performance of the pressure reducing valve also proposed more stringent requirements. [0003] The valve body is commonly used valve cone form the valve body, the valve body is fixed to the spring, when the high-pressure gas loaded onto the valve body, t...

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Problems solved by technology

[0005] This method is especially suitable for pressure reducing valves with high pressure difference and small flow rate. In the steady state, the gap between the conical valve core and the valve body of this type of pressure reducing valve is very small, about 1%. , FLUENT's existing dynamic mesh update methods (namely smoothing method, dynamic layer method and mesh reconstruction method) cannot obtain better mesh quality, and even produce negative volume mesh, resulting in the termination of calculation

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