CFD Online Discussion Forums

CFD Online Discussion Forums (https://www.cfd-online.com/Forums/)
-   OpenFOAM Running, Solving & CFD (https://www.cfd-online.com/Forums/openfoam-solving/)
-   -   No of simulated particles and No of real molecules in DSmc Simulation (https://www.cfd-online.com/Forums/openfoam-solving/119559-no-simulated-particles-no-real-molecules-dsmc-simulation.html)

archeoptyrx June 19, 2013 16:55

No of simulated particles and No of real molecules in DSmc Simulation
 
Hello ppl ,

I am trying to simulate the knudsen number flow of 1 , using dsmc slover in OPENfoam .

For this i did the following ,

  1. mean free path = Kn *char length ; (some generated value)
  2. based on t collision model used , i have the formula for mean free path , from which i extract the number density
  3. i used this number density .
  4. Now i calculated t volume of the domain (wedge15 example in dsmc)
  5. No of real molecules = volume of domain * number density ; ( =1.35e17 )
  6. No of simulated molecules = no of real molecules / no of equivalent molecules ; (am i right ???? :confused:) = 67822.3
  7. what is the deltat??
The problem is when i run the simulation ,



The terminal window shows

No of real molecules = 1.7*** e17
No of dsmc particles = 35670 ;



I dont understand how it works . It will be great if someone helps me out . :confused::confused::(:confused:



Thanks


All times are GMT -4. The time now is 04:36.