Changes between Version 11 and Version 12 of gallery/movies

Timestamp:

Sep 14, 2010 3:10:14 PM (14 years ago)

Author:

maronga

Comment:

--

gallery/movies

@@ -76 +76 @@
 }}}
 {{{#!td style="vertical-align:top; border: 0px solid""
-'''Responsible:''' \\
-\\
-'''Description:''' \\
+'''Responsible:''' [[imuk/members/helmke|Carolin Helmke]]\\
+\\
+'''Description:''' \\
+Second sequence:\\
+Shown is the horizontal near-surface flow at z = 10m in a dry convective boundary layer. The particle color reflects the vertical velocity at the current particle position (red: upward, blue:downward). The near-surface flow is dominated by hexagonal cells with weak downdrafts in their centers and strong narrow updrafts within the lines of convergence between the cells. This flow pattern is sometimes called spoke-like pattern. Big plumes with cumulus clouds at their top can always be found at those centers where several spokes are merging. Although a very high grid resolution has been used, the pixel resolution used here does not allow to see any detailed small-scale flow structures. This sequence shows the last 15 minutes of a model run with 1.5 hours simulated time in total.\\
+\\
+Third sequence:\\
+The simulation and particle features are the same as for the second sequence, but here only a part of the horizontal domain with a size of 400 m x 400 m is shown. The fine grid spacing allows to resolve vortex-like structures which develop within the convergence lines. Some of them are part of dust-devil-like vortices (see next sequence).
 ||||='''Model Setup'''  =||
 ||Total domain size (x|y|z):||m x m x m||
@@ -109 +114 @@
 }}}
 {{{#!td style="vertical-align:top; border: 0px solid""
-'''Responsible:''' \\
-\\
-'''Description:''' \\
+'''Responsible:''' [[imuk/members/franke|Theres Franke]]\\
+\\
+'''Description:''' \\
+This animation displays 3d-views of the lower 150m of the same convective boundary layer as shown before. Particles are released near the surface in those areas, where the dynamic pressure is below a specified threshold of -2 Pa. This allows to visualize dust-devil like vortices, which always have a pressure minimum in their center. The particle color displays the magnitude of horizontal velocity (red: fast, blue: slow). At the end of the sequence, two dust devils with opposite rotation collide and cancel out each other due to conservation of angular momentum. 
 ||||='''Model Setup'''  =||
 ||Total domain size (x|y|z):||m x m x m||
@@ -154 +160 @@
 }}}
 {{{#!td style="vertical-align:top; border: 0px solid""
-'''Responsible:''' \\
-\\
-'''Description:''' \\
+'''Responsible:''' [[imuk/members/heinze|Rieke Heinze]]\\
+\\
+'''Description:''' \\
+Atmospheric vortex streets consist of two rows of counterrotating mesoscale eddies with vertical axis in the wake of large islands. They resemble classical K�rm�n vortex streets which occur in laboratory experiments behind a cylinder. Usually, atmospheric vortex streets can be found in the stratocumulus capped mixed layer over the ocean when there is a strong elevated inversion well below the island top.\\
+\\
+In the animations the island consists of a single Gaussian shaped mountain with a height of about 1.3 km and a base diameter of about 12km. Particles are released in one layer and act as passive tracers. Their vertical motion is disabled. The colour of the particles reflects the difference between the temperature at the respective particle position and the mean temperature, horizontally averaged over the total domain. Blue/red colours represent a relatively low/high temperature. The animation shows that the cores of the eddies are warmer than the environment. The length of the animation corresponds to about 14h real time.
 ||||='''Model Setup'''  =||
 ||Total domain size (x|y|z):||m x m x m||
@@ -188 +197 @@
 }}}
 {{{#!td style="vertical-align:top; border: 0px solid""
-'''Responsible:''' \\
-\\
-'''Description:''' \\
+'''Responsible:''' [[imuk/members/witha|Björn Witha]]\\
+\\
+'''Description:''' \\
+Leads in sea ice are responsible for most of the latent and sensible heat transfer from ocean to atmosphere within the marginal ice zones. The animation displays a flow along x (from left to right with a geostrophic wind of about 3 m/s) from sea ice over a lead of 1000m width. The incoming flow is laminar (without turbulence), neutrally stratified, and capped by an inversion above 300m. The surface temperature of ice is assumed to be -23.3C, while the open sea water has a temperature near the freezing point of about -3C. Particles are released near the surface and closely below the inversion. The particle color reflects the buoyancy at the current particle position (red: positive, blue: negative). The particle size is proportional to the magnitude of the vertical velocity component. Cyclic boundary conditions along y are assumed. Convection is generated above the lead but the flow re-stratifies soon after passing the lead. The spatial resolution of the model is still insufficient to resolve the turbulent convection above the first half (upstream part) of the lead.
 ||||='''Model Setup'''  =||
 ||Total domain size (x|y|z):||m x m x m||
@@ -233 +243 @@
 }}}
 {{{#!td style="vertical-align:top; border: 0px solid""
-'''Responsible:''' \\
-\\
-'''Description:''' \\
+'''Responsible:''' Marcus Letzel\\
+\\
+'''Description:''' \\
+This animation shows the turbulent flow field generated by a single cube with an edge length of 50m. The initial flow is laminar (from left) with a mean speed of 1 m/s, and neutrally stratified. The particle color displays the height above ground (red: high, blue: low). The wake vortex behind the building is especially dominant. The side view also shows the evolution of a roof vortex. Since cyclic boundary conditions along x and y are used, the turbulence generated on the lee side of the building hits the building again from the luv side after some time.
 ||||='''Model Setup'''  =||
 ||Total domain size (x|y|z):||m x m x m||
@@ -267 +278 @@
 }}}
 {{{#!td style="vertical-align:top; border: 0px solid""
-'''Responsible:''' \\
-\\
-'''Description:''' \\
-||||='''Model Setup'''  =||
-||Total domain size (x|y|z):||m x m x m||
-||Grid spacing (x|y|z):||m x m x m||
-||Number of grid points (x|y|z):|| x x ||
-||Simulated time:|| s||
-||CPU-time:||||
-||Number of CPUs:||||
-||Machine/ processor type:||||
-}}}
-
-
-\\
+'''Responsible:''' [[imuk/members/raasch|Siegfried Raasch]]\\
+\\
+'''Description:''' \\
+Turbulent flow around a city quarter of Hannover. The mean flow is from west (right) with a speed of 1 m/s (neutral stratification is assumed). Clouds of particles are periodically released in front of the large building (Allianz tower) and in the courtyard of another complex of buildings. The particle color reflects the height above ground (red: high, blue: low). Topography data are from laser altimeter measurements (kindly provided by the Institut für Kartographie und Geoinformatik, Leibniz Universit�ät Hannover). The resolution of the laser data allows to resolve cars on the street west of the Allianz building, staying there because of a red traffic light. The sequence shows that the turbulent flow within street canyons is highly variable so that flow directions may change completely within short times.
+||||='''Model Setup'''  =||
+||Total domain size (x|y|z):||m x m x m||
+||Grid spacing (x|y|z):||m x m x m||
+||Number of grid points (x|y|z):|| x x ||
+||Simulated time:|| s||
+||CPU-time:||||
+||Number of CPUs:||||
+||Machine/ processor type:||||
+}}}
+
+
+\\