BIOPH

SUGAR BEET CLAMP CFD MODELLING: GENERAL REFINEMENTS

OpenFOAM version: 9 Solvers: pimpleFoam and clampPimpleFoam v6 Case: clamp_22 GENERALLY QUITE WELL = NOT GOOD ENOUGH. Now that the model seems to work generally quite well, it’s time to start improving it. Here are some issues and fixes implemented in this step in the process. Deal with conduction at the boundary of the clamp.…
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SUGAR BEET CLAMP CFD MODELLING: SWAPPING INLET AND OUTLET

OpenFoam version: 9 Solvers: clampPimpleFoam (v5), pimpleFoam Case: clamp_16 IT’S ALIVE I’m not sure if this is the most elegant solution available within the OpenFoam environment, but to swap the inlet and outlet, simply, two different geometries are used. When the air is flowing left-to-right (ltr), the geometry with the inlet on the left is…
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SUGAR BEET CLAMP CFD MODELLING: FIRST REAL TEST.

Feature image: A logo fitting of this project OpenFoam version: 9 Solver: pimpleFoam and clampPimpleFoam v5 Case: clamp_15 JUST ENJOY 35 hours of simulation using actual field data. I’m not going to ruin this moment by comparing the model results with the experimental temperature data taken from within the clamp… For reference, it took ca.…
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SUGAR BEET CLAMP CFD MODELLING: IMPLEMENTING A STRATEGY FOR DEALING WITH PRECISION ISSUES

Feature image: A clamp cover blowing in the wind. OpenFoam version: 9 Solver: pimpleFoam and clampPimpleFoam v5 Case: clamp_14 THE PROBLEM In the last post in this series, it was noted that there was an issue with dt being too small for this case. The proposed solution was to run the simulations in two steps:…
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SUGAR BEET CLAMP CFD MODELLING: A STRATEGY FOR DEALING WITH PRECISION ISSUES

Case: clamp_13 (eg of clamp_13_05) Solver: clampPimpleFoam v5 OpenFOAM version: 9 THE ISSUE What the actual issue is, is actually not 100% clear, but some strange behaviours in the model have been observed and noted in previous posts. This is a summary of it: The change in the temperature of the solid over time =…
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REGEN AG PODCAST EP 78: ADAM CHAPPELL

Photo credits: AgCast Good episode. “Cover crops … took us from the brink of bankruptcy to a profitable enterprise today.” Whether or not the quote is accurate needs checking, but the message is right. Cover crops: Adam notes that cover crops are winning everywhere in their system: in floods, they protected the soil from washing;…
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SUGAR BEET CLAMP CFD MODELLING: IMPLICIT T IN INTER-PHASE HEAT TRANSFER

OpenFOAM version: 9 Case: clamp_12 Solver: clampPimpleFoam v4 A NEW SOLVER VERSION A lot of small fixes have be made on v3 of clampPimpleFoam. It’s time for a new version. The focus of this version will be to make Ts and Tf in TsEqn and TfEqn implicit instead of explicit. Previously, these were included as…
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SUGAR BEET CLAMP CFD MODELLING: HEAT OF RESPIRATION AND CONVECTION ONLY

OpenFOAM version: 9 Case: clamp_11 Solver: clampPimpleFoam v3 BACKGROUND So far, the clamp modelling project has developed to the point where basically all the components of the model are in place. However, and as noted in the last post in the Results section, issues remain. The rate of heat transfer in the porous zone is…
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OpenFOAM – AIR FLOW THROUGH A VENTILATED SUGAR BEET CLAMP. UPDATE

In the first attempt at finding a solution to this model, the wrong kinematic viscosity was used. This permitted a solution to be found, but it was worthless. Once the correct kinematic viscosity for air was given, the steady state model would just diverge. The reason appears to be the simple fact that the model…
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