timbo wrote: ↑
Mon Dec 17, 2018 9:30 am
OK, so I am physical chemist. Among other thing we study is the vaporization of low-volatile substances.
We have an experimental setup where a substance vaporizes from the very small surface heater and is carried away with the flow of the gas.
On of the important parameters in the calculations of the system is the flow velocity over the surface and the thickness of the stagnant/boundary layer.
There are some more or less good models, but I wanted to maybe try CFD for this problem. The thing is I am totally naive to the CFD.
So can anybody provide any advice on where to start and if there are some free/open-source tools for the CFD?
Just to clarify what it is you are looking to simulate, are you looking into blowing across a flat surface to convect away these vapourised chemicals, or is it purely a buoyancy dominated flow?
If you are looking to blow across a flat plate at some given speed, there are equations called the "Blasius Flat Plate" theory which define the exact solution to this problem, which would give you boundary layer thicknesses as well as velocity, skin friction, local Re, etc. all by hand almost.
If the flow is buoyancy dominated, then that is an area I don't have too much experience with, however, I know that OpenFOAM which is Open Source does have a "bouyancyFOAM" type solver which can be used. However, with its super steep learning curve required, I would recomend checking Simscale as mentioned above (which is a sort of "super robust" web based CFD solver based on OpenFOAM code) which you could find many tutorials on and perhaps even copy someone elses public simulation and adapt it to suit your needs.
As always, feel free to ask me for any help if you need it and I'll do my best to do so.