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COMSOL 6.3: No Laminar Inflow boundary condition?
Posted 2025年5月7日 GMT+8 03:44MicrofluidicsVersion 6.31 Reply
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Hello,
How can I access theLaminar Inflowboundary condition in COMSOL 6.3?
I am working with the Laminar Flow module and I wish to apply aLaminar Inflowboundary condition to my inlet as perthese youtube instructions(timestamp 6:40). However, in the drop-down menu, there is noLaminar Inflow, onlyFully-developed Flow, which does not allow me to specify anEntrance pressureandEntrance Length.
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Hello Zane,
In the documentation, in the Theory of laminar flow, a section "Fully Developed Flow (Inlet)" describes what you refer to. There is in V6.3 an automatic detection of the length L, instead of an arbitrary fixed value in older versions. If you want to access/modify this value L, expand the Inlet boundary condition to find the corresponding "Equation View" (you need to activate this possibility of viewing the details of the equations in the "Show more options" menu). You will find spf.inl1.L = 10sqrt(spf.inl1.intop(1)) in 3D, as it is described in the doc. The entrance pressure is renamed into average pressure in the context of the Fully Developed Flow, I believe this is better terminology. So it seems like the condition you are looking for has just improved a bit over time.
Hope this helps! Eric Favre
