- **FLOW-3D**
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- - **mass source difficulty**
(*https://www.cfd-online.com/Forums/flow-3d/85836-mass-source-difficulty.html*)

mass source difficultyHi, i am trying to model an initial air environment with no inflow from any boundary. i have created a solid stl as a mass source with a positive value and another as a sink with a marginally smaller value,
i have run the simulation and cannot get movement, i have read every detail that i can find, but it eludes me somewhat.:confused: |

Hi Robert,
What FLOW-3D version are you working with? Assuming you are modeling air as compressible fluid, you need to use a two-fluid model with compressible gas (NMAT=2, ICMPRS=1), initialize fluid #2 (gas) in the domain (default). set its initial pressure and temperature (PRESI and TEMPI) Activate mass source model for the second fluid, IQSR=2, and define to solid components with the mass flow rate defined. The temperature and density at the source must also be deifne, RHOQSR and TQSR. If you are modeling air as incompressible fluid, then it is a bit simpler. You need to use the one -fluid model with no free surface (NMAT=1, ITB=0), initialize fluid #1 in the domain (default). Activate mass source model for the second fluid, IQSR=1, and define to solid components with the mass flow rate defined. |

replyThank you Michael for the reply,
I think it is 9.3v, I am modeling as incompressible for now, but assuming (second fluid, IQSR=1,) was a typo i thought that i had done exactly that. I have a slot later in the week, I'll double check. thanks again Robert:) |

yes, of course, i meant activate mass source for the first fluid with IQSR=1, sorry.
How come you are running such an old version? Does it have a customization? |

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