Computational Details:

"Merger of three parallel pipe flows (different speeds I) at medium Reynolds number"

• length of pipes/channel/total: 4/30/34
• height of channel/each of the pipe : 3.2/0.9
• inflow b.c.'s: the parabolic u-velocity profiles at the inlet of each of the pipes have maximum value of 1 or 2 for the middle inflow pipe. For small times (during the startup until T=1) the inflow speed is weighted by MIN(1,T)
• outflow b.c.'s: natural "do nothing" b.c.'s at the right outlet
• other b.c.'s: zero velocity at fixed walls
• initial condition at t=0: starting from rest
• viscosity parameter: 1/nu=1,000,000

• coarse mesh (=level 1): 204 cells, 250 vertices, 1,110 d.o.f.'s
  

  
  
  

• coarse mesh in a zoomed region
  

  
  
  

• uniform refinements with exact boundary adaption
• visualization on level 4: 13,056 cells, 13,417 vertices, 66,000 d.o.f.`s
• computational mesh on level 6: 208,896 cells, 210,337 vertices, 1,047,360 d.o.f.`s
• nonconforming nonparametric rotated bilinear fem's (meanvalue version), UPW

• equidistant time stepping for computation with k=0.011111112
• equidistant time stepping for visualization with k= 0.1 (= 1 frame)
• Total time T= 50 seconds corresponds to 4,500 time steps
• fractional step theta scheme

• date: 01/20/98
• simulation by: S.Turek/L.Seioukova
• visualization by: L.Seioukova
• SUN ULTRA 45/250: 175 MB, 202,109 seconds
• AVS data: 1,059 MB
• Software: FEATFLOW1.0 + BOUSS

• For more details about numerical and algorithmic aspects see the `Mathematical Background' in the FEATFLOW manual or visit our paper archive for much more details.
• The problem-specific data for the applied software version including parameter files and input data can be downloaded here!