A long time ago (2021-02-17), I wrote that I had a feeling there was something wrong with my CFD model of a sugar beet clamp – the rates of air flow seemed a bit low when compared to a few roughly similar cases. It turns out, there was something wrong with it. The viscosity of…
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It’s a very idealised version of a clamp, but it feels pretty OK. The clamp is 8m wide, 2.4m high, and the cross section is 3m broad. The ventilation pipe is 20cm in diameter, and 5.5m long, from x = 0. There are 12 holes in the pipe, each 6cm in diameter and centered at…
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To verify my CFD model of a sugar beet clamp, measurements of air speed inside of the clamp are desired. It’s something that I have not been able to do with a simple, post-clamp-construction method. In 2021, it is time to test a more embedded, set-up-at-harvest method. To this end, I’ve turned to do-it-yourself electronics.…
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!!!!! THE VALUE USED FOR KINEMATIC VISCOSITY IN THE SIMULATION THAT IS DESCRIBED IN THIS POST WAS INCORRECT. THE DARCY-FORCHHEIMER COEFFICIENTS, HOWEVER, DO SEEM TO BE CORRECT. FOR AN UPDATED ON THE RESULTS IS AVAILABLE !!!!! In 2003, Lope G. Tabil and three co-authors decided that they would make my 2021 life much much easier…
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Just a quick reminder 1st attempt: flow over a structure the shape of a clamp 2nd attempt: flow through a porous clamp This attempt: flow through a porous clamp with a less porous cover added The cover is 5cm normal to the surface. At a ca. 34 degree angle of repose, this makes the cover…
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After getting familiar with OpenFOAM by building a model of airflow around a clamp, it was time to start looking in the clamp. To be honest, I’ve been waiting 2.5 years for this moment, so I was pretty keen to get a model that worked, regardless of whether it has the right parameters or not.…
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The love-hate relationship builds. The things I’m loving about OpenFOAM so far include: the price, the way it makes you understand what everything (every step, every parameter, every decision) is and means – the learning is much deeper, the way it make you understand that you’re asking the computer to do a lot of computations!…
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As part of the CFD course I’ve just been through, we had a group assignment. My team was kind enough to adopt the beet ventilation system we at NBR are developming to be the focus of our work. Here is the report (it’s pretty technical and unfortunately not highly conclusive): I hope we’ll get to…
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Drying out sugar beets isn’t usually a practice undertaken in their production – at least, not intentionally – and we’re not looking to change this – intentionally. The topic has come up after it became clear in one of my other projects that ventilation isn’t just good for cooling beets, it has the ability to…
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The storage period is short. Is building a scale model of a beet clamp a solution to extending this, for research purposes? In my mind, absolutely (obviously). I can’t imaging how much more we’d be able to learn about the thermo- and fluid dynamics of a clamp during one year if we could run 5…
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