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《Comptes Rendus Mecanique》2014,342(6-7):403-409
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This work concerns the modelling of stratified two-phase turbulent flows with interfaces. We consider an equation for an intermittency function which denotes the probability of finding an interface at a given time t and a given point . In Wacławczyk and Oberlack (2011) a model for the unclosed terms in this equation was proposed. Here, we investigate the performance of this model by a priori tests, and finally, based on the a priori data discuss its possible modification and improvements. 相似文献
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《International Journal of Solids and Structures》2007,44(18-19):6187-6200
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《International Journal of Solids and Structures》2006,43(3-4):459-474
The FEM is employed to study the effect of notch depth on a new strain-concentration factor (SNCF) for rectangular bars with a single-edge notch under pure bending. The new SNCF is defined under the triaxial stress state at the net section. The elastic SNCF increases as the net-to-gross thickness ratio h0/H0 increases and reaches a maximum at h0/H0 = 0.8. Beyond this value of h0/H0 it rapidly decreases to the unity with h0/H0. Three notch depths were selected to discuss the effect of notch depth on the elastic–plastic SNCF; they are the extremely deep notch (h0/H0 = 0.20), the deep notch (h0/H0 = 0.60) and the shallow notch (h0/H0 = 0.95). The new SNCF increases from its elastic value to the maximum as plastic deformation develops from the notch root. The maximum of the shallow notch is considerably greater than that of the deep notch. The elastic of the shallow notch is however less than that of the deep notch. Plastic deformation therefore has a strong effect on the increase in of the shallow notch. The variation in with M/MY, the ratio of bending moment to that at yielding at the notch root, is slightly dependent up to the maximum for the shallow notch. This dependence is remarkable beyond the maximum . On the other hand, the variation in with M/MY is independent of the stress–strain curve for the deep and extremely deep notches. 相似文献
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