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Comparison between compressible, dilatable and incompressible fluid hypotheses efficiency in liquid conditions at high pressure and large temperature differences. (English) Zbl 07073357
Summary: This work is devoted to comparing the compressible, dilatable and incompressible modeling approach for reproducing the unsteady TOPFLOW test case PTS TSW 3-4. For this comparison, we use two codes: NEPTUNE_CFD and TRIO. In one hand, NEPTUNE_CFD allows adopting the compressible hypothesis with a URANS turbulence approach. On the other hand, TRIO can reproduce the other two assumptions with a LES turbulence approach. At first, the computations have been validated by comparing the numerical results with the experimental data concerning temperature evolution in time. The comparison shows that the incompressible hypothesis presents a more critical error than the other ones. Then, the velocity profiles obtained by the two codes are shown and compared with a twofold objective: first of all, showing a comparison between two turbulence modeling approaches and then to observe the turbulence structure and fluid dynamic developments. The velocity comparison shows an excellent agreement between the two codes.
MSC:
76 Fluid mechanics
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