Publikationsrepositorium - Helmholtz-Zentrum Dresden-Rossendorf

The test A of the test series performed at the UM2x4 loop test facility for the International Standard Problem ISP-43 was calculated with the CFD Code CFX-4.3. The results of the calculation show qualitatively good agreement with the experimental data. The structure of the flow field and the form of the propagating temperature perturbation front are well modeled by the CFD code. However, deviations occur at local positions. Comparative calculations with and without taking into account buoyancy have shown, that buoyancy effects are noticeable, but the mixing is mainly momentum controlled.