Numerical Simulation Of Multi-physics Coupling About A Double-layered Tube And Flow Field

In order to study the mechanical property’s changes of double-layered tube in the process of the liquid’s transportation. In this paper, based on the physical fields coupling procedure MpCCI, combined structure field analysis software of ABAQUS with the flow field calculation software Fluent, take Implicit solver technology with pressure coupling in combination with the k-epsilion turbulence model, to numerically simulate the mechanical property’s changes of double-layered tube about fluid-structure interaction、fluid-solid-heat coupling.The results showed that:under the common action of flow field and structure field, as the fluid flow, the mechanical properties of the double-layered tube has changed significantly, Such as the impact of the fluid will significantly change the physical properties of the inner pipe, make the inner pipe under the action of impact of fluid result radial outward expansive force, Due to the constraints of the outer pipe， makes the expansive force of the inner pipe obviously weakened along the border in the outer pipe and the inner pipe; Also, under the action of flow field、structure field and temperature field, the inner pipe based on the fluid-structure interaction, along with action of the temperature field, the expansive force of the inner piper to the outside has significantly increased, as the sequentially action of temperature field, the expansive force has increased significantly along the border in the outer pipe and the inner pipe。The outer pipe under the action of expansive force of inner pipe, mechanical properties of the outer pipe relative to fluid-structure interaction has increased obviously. Comparison of two types of fluid-solid-heat coupling, mechanics performance index of temperature field on the inside and outside wall of double-layered tube larger than temperature field only on the within wall, this suggests that mechanical properties are strongly effected from temperature of the different location of double-layered tube. Therefore, the mechanical behavior of double-layered tube effect from temperature field cannot be ignored, it also makes us in the study of double-layered tube had to take into temperature field’s influence.At the same time, based on the multi-physics coupling’s complex working conditions, for to change boundary condition of velocity-inlet of double-layered tube, in other words, through the UDF to more complexly change inlet velocity of double-layered tube, and then carries on the analysis and calculation of fluid-solid-heat coupling. Through the analysis of the results found that, change the boundary conditions about speed of double-layered tube inlet, mechanical properties of double-layered tube will be correspondingly change as the change of inlet velocity. But compared the influence of mechanical behavior effected from the temperature field with that, the influence of mechanics performance about double-layered tube effected from changed speed’s boundary conditions is little.This article through to analysis about multi-physics coupling of double-layered tube under the variety of working conditions, compare the calculation results of coupling analysis, the method to study problem about multi-physics coupling of double-layered tube by synergy coupling simulation of finite element analysis method has been verified is feasible, and can provide some references to solve problems of more physical fields coupling about the experiment cost is high, can’t visualize in practical engineering.