Numerical Simulation on Comparison of Air Flow Distribution with Different Algorithms

To get the air distribution in a small cold store, a mini type cold store (4.5 m (1)x3. 3 m (w)x2. 5 m (h)) was referenced. The model of the small cold store was established in the software named GAMBIT and after this the three-dimensional numerical simulation was used. The different simulation result was verified by the experiments. The accuracy of simulation in airflow field in cold stores was studied by comparison of various mesh rezoning, various decoupling methods for airflow speed and pressure. The results showed that 10cm dimensional accuracy was the suitable mesh size for the calculation speed without affecting the simulation accuracy, and the SIMPLE algorithm was better for the PISQ algorithms to simulate steady air flow of the cooling process in a cold store without products. It was concluded that there was a large circumfluence in the flow field, the speeds in the center and corner were lower than those in other places. The distribution of flow speed in the horizontal plane had a good symmetrical, however that in the vertical plane was lower than that in the center, but higher upwards and downwards. The study validated 3D CFD simulation technology for the small cold store. The results of the research offered the optimized methods of using CFD and acted as the reference of the simulation model in the cold store.