The field was lifted 14 November, with an expected delivery date of 22 November. There was a lot of rain in the forecast for 15 November – ca. 40mm – which was to be followed by a small cold period of -2C for a few hours. The gut said cover the clamp. The rule-of-thumb guides…
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At first glance, by comparing the blockMeshDict files from the OpenFOAM.org User Guide, the blockMesh utility may have seen some changes. For the “Stress analysis of a plate with a hole” example, the mergePatchPairs command has disappeared from the dictionary. For the “Breaking of a dam” example, defaultPatch command has appeared. However, looking at the…
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The Pavitt taxonomy of invention in industry places agriculture is the bucket of “supplier dominated”. That is, most of the technological improvements in the sector come from the suppliers of the inputs (seed firms, fert firms, machinery firms, etc). This seems reasonable, given R&D is an expensive and risky game. Most farmers can neither afford…
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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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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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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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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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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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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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