Two-way fluid-structure coupled analysis for dynamic responses of steel tanks under vapor cloud explosion

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (15) : 199-208.

HU Ke2,1, ZHAO Yang1, WANG Gang2,GUO Yanjun2

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Abstract

Explosion fluid fields cause motions and deformations of steel tanks when their internal vapor cloud blasts. These motions and deformations conversely act the internal explosion flow fields. Thus, solving dynamic responses of steel tanks under internal explosion actually is a complex two-way fluid-structure coupling problem. Here, adopting a weakly coupled method, a two-way fluid-structure coupled model was built based on the simulation platform ANSYS Workbench to effectively simulate the interaction between a steel tank and its internal explosion flow field, and obtain the steel tank’s structural dynamic responses. Meanwhile, the uncoupling calculation was done and the uncoupling method and the coupling one were compared and analyzed. It was shown that under internal vapor cloud explosion, the maximum plastic strain appears at the circumferential connection between tank roof and tank wall, this zone’s failure is the first to exceed the failure strain due to plastic strain; the deformation and failure model of the tank obtained with the coupling analysis are basically identical with those using the uncoupling analysis, the uncoupling analysis can preliminarily predict dynamic responses and dangerous areas of tanks more easily.

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steel tanks / vapor cloud explosion / explosion loading / fluid-structure coupling / overpressure / CFD

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HU Ke2,1, ZHAO Yang1, WANG Gang2,GUO Yanjun2. Two-way fluid-structure coupled analysis for dynamic responses of steel tanks under vapor cloud explosion[J]. Journal of Vibration and Shock, 2018, 37(15): 199-208

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