Through ANSYS software method of valve core - the physical environment Stem fluid-structure interaction analysis system. The valve core - Stem will happen under the effect of flow physical displacement, displacement will change the size of the valve core moving boundary, which significantly influence the shape of the flow field. Fluid-structure coupling analysis in structure analysis for Industrial Valves core moving wall displacement, used for the flow field analysis. Specific fluid-structure coupling analysis of typical steps are as follows: 1, to create the geometry model, including the fluid field and the structure of the Industrial Valves body area. 2, creating a fluid physical environment: a given cell type to fluid field, but also determine the number of iterations, activate the turbulence model, applying boundary conditions. 3, create structural physical environment: set of information in the fluid physical environment, ready to define the structure physical environment. Unit conversion unit type and set options, set fluid field unit is NULL, the structure area gives unit type, structural boundary conditions, define the right step load and solving options, and then write file structure physical environment. 4, fluid/structure, solution cycle: in this system, the speed of entry as a general convergence criteria. When two Flotran solution inlet velocity difference enough hours, solve the end. The initial Flotran analysis set number of iterations should be far more, to facilitate better convergence. Subsequent fluid analysis because it is on the basis of previous fluid analysis heavy start, as a result, the number of iterations can be less. Structural analysis also need to restart. For nonlinear analysis, node must be restored to the original position before restart. Calculation performed 5 times in total coupling iteration, this paper first Flotran analysis iteration 100 times, in order to get high convergence precision, then the four Flotran analysis each iteration 40 times, can meet the accuracy requirement. Iterative 260 times, 250 times before taking before data is 0. 25 s displacement response.
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