Simulate world ocean
WOS - acronym (World Oceans Simulation)
Contents
experiments[edit | edit source]
on aw:WebGL[edit | edit source]
- world winds presentation
https://earth.nullschool.net Map data is provided by Natural Earth but must be converted to TopoJSON format. We make use of a couple different map scales: a simplified, larger scale for animation and a more detailed, smaller scale for static display. After installing GDAL and TopoJSON (see here), the following commands build these files:
Simulating Tens Of Thousands Of Independent Moving Objects
wikipedia:Modular Ocean Model[edit | edit source]
MOM has traditionally been a #level-coordinate ocean model, in which the ocean is divided into boxes whose bottoms are located at fixed depths. Such a representation makes it easy to solve the momentum equations and the well-mixed, weakly stratified layer known as the ocean mixed layer near the ocean surface. However, level coordinate models have problems when it comes to the representation of thin bottom boundary layers (Winton et al., 1998) and thick sea ice. Additionally, because mixing in the ocean interior is largely along lines of constant potential density rather than along lines of constant depth, mixing must be rotated relative to the coordinate grid- a process that can be computationally expensive. By contrast, in codes which represent the ocean in terms of #constant-density layers (which represent the flow in the ocean interior much more faithfully)- representation of the ocean mixed layer becomes a challenge.
Simulation of the World Ocean Climate with a Massively Parallel Numerical Model 2015[edit | edit source]
ACRANEB of RC LACE[edit | edit source]
Models[edit | edit source]
wikipedia:General circulation model[edit | edit source]
To "run" a model, scientists divide the planet into a 3-dimensional grid, apply the basic equations, and evaluate the results.
A simple general circulation model (SGCM) consists of a dynamic core that relates properties such as temperature to others such as pressure and velocity. Examples are programs that solve the primitive equations, given energy input and energy dissipation in the form of scale-dependent friction, so that atmospheric waves with the highest wavenumbers are most attenuated... the standard resolution of HadOM3 is 1.25 degrees in latitude and longitude, with 20 vertical levels, leading to approximately 1,500,000 variables...
Ocean general circulation model[edit | edit source]
OGCMs and AGCMs have much in common, such as, the equations of motion and the numerical techniques. However, OGCMs have some unique features. For example, the atmosphere is forced thermally throughout its volume, the ocean is forced both thermally and mechanically primarily at its surface, in addition, the geometry of ocean basins is very complex. The boundary conditions are totally different... nearly geostrophic turbulent eddies are the oceanographic counterparts of the atmospheric synoptic scale... they are relatively small in horizontal extent so that ocean climate models, which must have the same overall exterior dimensions as AGCMs, may require as much as 20 times the resolution as AGCM if the eddies are to be explicitly resolved.
level-coordinate[edit | edit source]
constant-density layers[edit | edit source]
Grids[edit | edit source]
wikipedia:Geodesic grid[edit | edit source]
Hierarchical Triangular Meshes[edit | edit source]
HEALPix[edit | edit source]
PYXIS[edit | edit source]
calculations[edit | edit source]
wikipedia:Geophysical fluid dynamics
Основы вычислительного теплообмена и гидродинамики
Существует несколько конкурирующих методов моделирования жидкости, каждый из которых имеет свои преимущества и недостатки. Наиболее распространёнными являются сеточные методы Эйлера, гидродинамика сглаженных частиц, методы, основанные на завихрениях, и метод решёточных уравнений Больцмана.
methods[edit | edit source]
Finite element method[edit | edit source]
Smoothed-particle hydrodynamics[edit | edit source]
- Fluids v.3 is a large-scale, open source fluid simulator for the CPU and GPU using the smooth particle hydrodynamics method. Fluids is capable of efficiently simulating up to 8 million particles on the GPU (on 1500 MB of ram).
- performance GPU (Harada), 2007: 49,000 частиц, 17 fps GPU (Zhang), 2009: 60,000 частиц, 57 fps
Модели турбулентности[edit | edit source]
LBM[edit | edit source]
Методы решёточных уравнений Больцмана... В отличие от многих других методов, метод LBM не решает уравнения Навье — Стокса, а моделирует поток ньютоновской жидкости дискретным кинетическим уравнением Больцмана. Столкновения зачастую учитываются с помощью модели Батнагара — Гросса — Крука. Методы решёточных уравнений Больцмана удобны благодаря их концептуальной и вычислительной простоте, их использование ограничено малыми скоростями и тем, что LBM обладает неустойчивым поведением на границе подвижных тел... Метод LBM рассматривает жидкость как совокупность относительно небольшого числа частиц, причем на каждом шаге рассматривается их распространение и столкновения (релаксация).