A dynamic mesh update method for fluid-structure interaction calculation of 3D complex pipelines

Abstract

The invention discloses a dynamic mesh update method for fluid-solid coupling calculation of three-dimensional complex pipelines, which includes: (1) establishing a finite-order dynamic model of complex pipeline systems based on the principle of mode reduction; (2) using FLUENT establishes the fluid domain calculation model of the complex pipeline system, and divides the pipeline system into several small blocks; (3) calculates the three-dimensional transient flow field in FLUENT, and calculates the flow acting on the pipelines of each small block at each time step Fluid force; (4) After the calculation of the flow field at each time step is completed, the finite-order dynamic model of the pipeline system is called through UDF, and the fluid force vector on the acting pipeline is read in, and the vibration displacement of each point on the pipeline is calculated; ( 5) According to the above dynamic calculation results, the coordinate values ​​of each grid node of the pipeline are updated through UDF, and the fluid domain changes accordingly. The method of the invention can still maintain good grid quality when the pipeline vibrates at the same time for a long time, with a large amplitude and multiple frequencies, so that the fluid-solid coupling transient calculation can be carried out smoothly.

Description

technical field [0001] The invention belongs to the technical field of fluid-solid coupling dynamics of complex pipelines, and in particular relates to a dynamic grid updating method for calculation of fluid-solid coupling of three-dimensional complex pipelines. Background technique [0002] In the fields of machinery, chemical industry, aerospace and other fields, piping systems are widely used in industrial production and equipment manufacturing. There are many joints, including various valves, etc. When the compressors, pumps and other equipment at the front and rear ends of the pipeline system work, there will inevitably be periodic or random changes in displacement and discharge pressure, impacts will occur at the elbows of the pipeline, and there may be acoustic resonance in the fluid in the pipeline, so , the fluid-solid coupling vibration of the pipeline is a common problem. The vibration will cause noise, fatigue damage, cracks and other damage to the pipeline. In ...

AI Technical Summary

Problems solved by technology

When the compressors, pumps and other equipment at the front and rear ends of the pipeline system work, there will inevitably be periodic or random changes in displacement and discharge pressure, impacts will occur at the elbows of the pipeline, and there may be acoustic resonance in the fluid in the pipeline, so , the fluid-solid coupling vibration of the pipeline is a common problem. The vibration will cause noise, fatigue damage, cracks and other damage to the pipeline. In severe cases, it may cause the pipeline to break and cause catastrophic production and safety accidents. At the design stage, great attention is paid, and related calculations and checks are carried out, which involves the fluid-solid coupling calculation of the piping system

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