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In this computational run, I designed a small duct with a cylinder inside of it. This geometry was meshed using Ansys Workbench, pre-processed using CFX, and post-processed using CFX. It was solved using CFX with a LES Turbulence Model turbulence model and was run on one core.
The job took nearly 24 hours to solve and resulted in around 8 sec of simulation-time data.
The length of time this model took to run has made me realize CFX will not be an acceptbale solution to modeling the entire Flume. Even with the help of John Harris in the ECE dept and the use of his cluster (allowing illegal ansys), the solution to an LES problem of that scale will take too long to solve. I would need more computing power, and the only other option is to run CFD code on something like System X. If I do this though, I will need to make sure I run legal software. So I cant use CFX.
At this point, I have found another CFD code that might work well. It is called Open_Foam, an open source, GPL, project. It includes many DNS and LES solvers
Post-Processing Results
VRML file of velocity vectors at 0.3sec
VRML file of velocity vectors at 4.3sec
VRML file of wall pressure at 0.3sec
Job Statistics
+--------------------------------------------------------------------+
| Job Information |
+--------------------------------------------------------------------+
Run mode: serial run
Host computer: RCO-BEAST
Job started: Mon Oct 16 23:13:11 2006
+--------------------------------------------------------------------+
| Memory Allocated for Run (Actual usage may be less) |
+--------------------------------------------------------------------+
Data Type Kwords Words/Node Words/Elem Kbytes Bytes/Node
Real 4863.0 740.86 140.96 18996.1 2963.44
Integer 1573.5 239.71 45.61 6146.3 958.84
Character 2323.4 353.96 67.35 2269.0 353.96
Logical 40.0 6.09 1.16 156.2 24.38
Double 215.0 32.75 6.23 1679.6 262.03
+--------------------------------------------------------------------+
| Total Number of Nodes, Elements, and Faces |
+--------------------------------------------------------------------+
Domain Name : Pipe
Total Number of Nodes = 6564
Total Number of Elements = 34499
Total Number of Tetrahedrons = 34499
Total Number of Faces = 2630
+--------------------------------------------------------------------+
| Average Scale Information |
+--------------------------------------------------------------------+
Domain Name : Pipe
Global Length = 1.4885E-01
Minimum Extent = 8.2000E-02
Maximum Extent = 3.0000E-01
Density = 9.9700E+02
Dynamic Viscosity = 8.8990E-04
Velocity = 1.0000E-01
Advection Time = 1.4885E+00
RMS Courant Number = 3.2269E-02
Maximum Courant Number = 1.0529E-01
Reynolds Number = 1.6676E+04
[run]
+--------------------------------------------------------------------+
| Average Scale Information |
+--------------------------------------------------------------------+
Domain Name : Pipe
Global Length = 1.4885E-01
Minimum Extent = 8.2000E-02
Maximum Extent = 3.0000E-01
Density = 9.9700E+02
Dynamic Viscosity = 8.8990E-04
Velocity = 3.3797E+00
Advection Time = 4.4042E-02
RMS Courant Number = 9.4047E-01
Maximum Courant Number = 3.0608E+00
Reynolds Number = 5.6361E+05
+--------------------------------------------------------------------+
| CPU Requirements of Numerical Solution |
+--------------------------------------------------------------------+
Subsystem Name Discretization Linear Solution
(secs. %total) (secs. %total)
----------------------------------------------------------------------
Wall Scale 1.16E+00 0.0 % 7.19E-01 0.0 %
Momentum and Mass 5.52E+04 68.9 % 1.06E+04 13.3 %
-------- ------- -------- ------
Subsystem Summary 5.52E+04 68.9 % 1.06E+04 13.3 %
Variable Updates 8.67E+03 10.8 %
Miscellaneous 5.63E+03 7.0 %
--------
Total 8.01E+04
+--------------------------------------------------------------------+
| Job Information |
+--------------------------------------------------------------------+
Host computer: RCO-BEAST
Job finished: Tue Oct 17 22:54:37 2006
Total CPU time: 8.013E+04 seconds
or: ( 0: 22: 15: 29.516 )
( Days: Hours: Minutes: Seconds )
Total wall clock time: 8.529E+04 seconds
or: ( 0: 23: 41: 26.000 )
( Days: Hours: Minutes: Seconds )
Original Files
Categories: Cfd Work