tailieunhanh - Computational Fluid Dynamics 2011 Part 2

Tham khảo tài liệu 'computational fluid dynamics 2011 part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 24 Computational Fluid Dynamics 5 02 I 5 02 I 02 F 5 02 02 02 5 02 02 I 5 02 I 5 02 I 5 02 I 5 02 I 5 02 I 5 02 fl 5 02 L 5 02 I 5 02 5 02 5 02 02 5 02 Contours of Static Temperature k __ Jan 16 2006 FLUENT 2d segregated lam Fig. 24. Temperature contours around the crack Jet simulation and results In this section we simulated a jet of natural gas developing outside a tank hitting a stationary wall some distant apart. Jet velocity contours are shown in Figure 25. One can recognize the impinging region and how the fl ow direction changes because of stagnation spot. The altered stream strikes the wall of the adjacent components here another tank with the same height and leaves a certain areathat is exposed to impingement under less strength. Thus the temperature of this area becomes relatively higher. It is concluded from the Simula tion that temperature distribution along the adjacent wall can be divided into three regi ons Figures 26a 26b 1. Impinging point vicinity 2. Sharp variation region 3. Mild variation region As seen in the jet velocity profile near the adjacent wall in Figure 25 the flow slightly alters then severely changes its direction to become parallel to the wall as it moves closer. Thus there is a certain distance on the wall that stagnation or circulated flow eddies are in contact with the wall. Hence the temperature of this region decreases sharply from a certain value at stagnation spot then increases genly along the rest of distance on the wall. Applications of CFD in Natural Gas Processing and Transportation 25 E2bf D2 E J9t D2 2 5Et D2 277e- D2 2 IC- D2 D2 2- 2E-Ở D2 D2 IS- e D2 I79t D2 l Et D2 M e D3 l De D2 D2 Ạ73e D I 3- .lht D I D I 4SDC- D I E27t D I l e D I IJMc-D I Vefccbf VtcLore Cc xrt EỊ1 Vriocbf ktiqntudỡ finite Thie-E 12bỄ-D2j .Ể-UỊỊ 24 2DDb FL u ENT b 2 2d coupled hip Eke- unE beady Fig. .