Transport and settling of suspended particles in a simulated estuary: particle-laden freshwater enters a basin filled with seawater. The white iso-surface indicates 50% of the original particle density. Kelvin-Helmholtz instabilities evolve in the shear flow and drive the turbulent mixing. Rayleigh–Taylor instabilities can be observed in the initial settling phase. Based on Direct #Numerical #Simulation.
#sedimentation #estuary #fluiddynamics #turbulence #CFD #computationalfluiddynamics
Another one from the archive: turbulent mixing of sediment-laden freshwater and seawater (black). The white iso-surface indicates a 50/50 mix. The freshwater enters the basin at the bottom left. Direct #Numerical #Simulation.
#sedimentation #estuary #fluiddynamics #turbulence #CFD #computationalfluiddynamics
Snapshot of the turbulent mixing of sediment-laden freshwater (black) and seawater (white / grey) in a modelled estuary. The scene is seen from the top. The freshwater enters from the bottom of the picture.
The results were obtained from a Direct #Numerical #Simulation. Only half of the domain is simulated (the other half is mirrored). Only the interesting part is shown (the simulated domain is actually a lot bigger).
#sedimentation #estuary #fluiddynamics #CFD #computationalfluiddynamics
#numerical : belonging to number
- French: numérique
- German: zahlenmäßig
- Italian: numerico
- Portuguese: numérico
- Spanish: numérico
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Exploration of evidence for #numerical thinking in the #Palaeolithic
https://www.sciencedirect.com/science/article/abs/pii/S0003552125000317
🔄 Power transforms help reshape data toward a Gaussian distribution
💥 Overflow errors are common when implemented naively
🛠️ This post dives into the cause and shows practical solutions
Many animal species, including primates, birds, and fish, exhibit a sense of number known as #Numerical #Competence, allowing them to discriminate and compare quantities of objects.
This foundational ability is thought to be an ancient cognitive trait, suggesting that the basic mechanics for perceiving quantity are shared by humans and other animals.
https://knowledgezone.co.in/posts/Animals-that-could-do-Math-6762bb557b620f019ff7fbb3
After quite some weeks of work I have quantified the #numerical error of several #FFT implementations compared to my own.
This was done by implementing an arbitrary precision FFT to compute the true value.
For each implementation we compare the L1, L2 and Linfinity norms as well as #rms
The theoretical l2 bound is derived by Nicholas J.Higham in his famous book 'accuracy and stability of numerical algorithms'
The Linf bound from P. Henrici 'Applied and Computational Complex Analysis'
#numerical : belonging to number
- French: numérique
- German: zahlenmäßig
- Italian: numerico
- Portuguese: numérico
- Spanish: numérico
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pointer
WordofTheHour
Radical Anthropology
Xuefeng Xu
Knowledge Zone
Dantali0n 
