• Title/Summary/Keyword: 링형 와류

Search Result 2, Processing Time 0.014 seconds

The Optimum Design of Flow Characteristics in Fermentation (발효조 내의 유동특성 최적화 설계)

  • 박상규;김기성;양희천
    • Proceedings of the Korean Society of Marine Engineers Conference
    • /
    • 2001.05a
    • /
    • pp.117-121
    • /
    • 2001
  • A numerical simulation was conducted to investigate the effect of height position of Rushton type Impeller in the fermentation. The computational method was based on the CFX code. The simulation was performed for 3 height differences(25, 30, 35mm) between Rushton type impeller and bottom of fermentation. The instantaneous flow fields showed that the bulk flow consisted of large scale vortices. However the main flow results showed that the formation of ring vortices above and below the impeller depended on the height of the impeller.

  • PDF

A THREE DIMENSIONAL LEVEL SET METHOD FOR TWO PHASE FLOWS (Level Set 법을 이용한 삼차원 이상유동 해석에 관한 연구)

  • Kang, D.J.;Ivanova, Ivelina Ivanova
    • Journal of computational fluids engineering
    • /
    • v.13 no.4
    • /
    • pp.126-134
    • /
    • 2008
  • We developed a three dimensional Navier-Stokes code based on the level set method to simulate two phase flows with high density ratio. The Navier-Stokes equations with consideration of the surface tension effects are solved by using SIMPLE algorithm on a non-staggered grid. The present code is validated by simulating two test problems. First one is to simulate a rising bubble inside a cube. The thickness of the interface of the bubble is shown to affect the pressure distribution around the interface. As the thickness decreases, the pressure field around the interface becomes more oscillatory. As the bubble rises, a ring vortex is shown to form around the interface and the bubble eventually develops into an ellipsoidal shape. Merge of two bubbles inside a container is secondly tested to show the robustness of the present code for two phase flow simulation. Numerical results show stable and reliable behavior during the process of merging of two bubbles. The velocity and pressure fields around the interface of bubbles are shown oscillation free during the merging of two bubbles.