mass conservation
Hello, can somebody tell me, if the continuity equations needs to be fulfilled for a background gas species (in DC discharge plasma or diluted species) if I am not interested in the distribution of...
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Laura, Yes, I believe the continuity equation must be fulfilled to get a consistent solution. Since the software is solving for the mass fraction of the ions, any non-conservation of the total mass...
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What kind of equations do you have? Why can't you just keep this background gass a constant (or a constant function of time and space)? To me it seems this kind of problem, that the background does not...
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Thank you for the reply, the gas density comes from gas dynamic simulation. The background gas density decreases towards the ends to about 0.05- 0.02 of the density at the injection in the middle of...
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Laura, For some reason, the software is initially seeing a zero or negative pressure when the solution process is begun. I'm not sure of the reason for this (it does not appear to be caused by the...
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Thank you Luke, now the model is running. But there still seems tobe a problem with the in- and outgoing fluxes. The incomming flux is the integrated T+ rate (respecting the recombination). The...
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Laura, How large is the difference between the net production and the outgoing flux? Could you upload the 2D model in which you see the discrepancy? -- Luke Gritter AltaSim Technologies
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Hello Luke, in the model I attached the difference is up to four orders of magnitude. The flux that goes out is much larger than the created number of ions. When I look at the 1D ion flux in y...
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I changed the ion outflow BC at the side walls by an recombination surface reaction and used the T+ outflow BC only at both ends and in the middle of the tube(at the T-inlet). Now the incomming rate...
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Laura, Both Inlet and Outlet boundary conditions should be defined for T+. The Inlet boundary condition for T is not actually being used because T is not being solved for. When I add an Inlet boundary...
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Hello Luke, thanks for your helpful answear. I tried to implement th T+ inlet but somehow I cannot get a solution for the model. Either there are these strange potential values or the solver gives the...
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Hello Luke, when looking at the creation rate of ions it is much higher in my solution than the 2.6e13 1/(ms) from your solutinn. I get 1.85e14 /(ms). this is again much higher than the outgoing...
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Laura, I've attached the file (the solutions have been cleared). The high electric potential is due to the boundary conditions - the electrons are lost at the upper and lower boundaries, but the ions...
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