Learning Forum

[Anshul]

Hi all,nI am simulating a reforming reaction in 2D-axisymmetric case. While putting velocity inlet condition, I am specifying the concentration of inlet species. Say for example. 0.47 for methanol. But as I run the simulation, and get convergence ( less than 10e-05), it seems that the boundary condition of species is changed.nHow this is possible as boundary condition should remain same as given by user. I also monitor the mole fraction of methanol while running calculation, it seems to drop sudden at start from 0.47 to 0.29 etc..nHowever, if I increased the inlet velocity then this change is decreasing. I am not understanding why this is happening?nAlso, for pressure outlet condition, I have put 0 value for the species. Is it happening due to reverse flow?nPlease help me with this.nnAnshuln

[Rob]

The boundary condition should be respected, and if you do a surface report what do you see? Similarly plot volume fraction on the inlet only with node values off and local range. n

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I also had the same problem and checked the mass weighted average values at the inlet of species despite giving boundary conditions at the inlet. To make it correct we have to mark “Inlet diffusion” in the species transport model, because as soon as species enters reaction starts.