Changes between Version 12 and Version 13 of gallery/movies/cbl
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- Jul 8, 2014 8:37:57 AM (11 years ago)
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gallery/movies/cbl
v12 v13 1 = = Convective boundary layer with horizontally homogeneous heating ==1 = Convective boundary layer with horizontally homogeneous heating = 2 2 [[TracNav(gallery/toc)]] 3 3 The following visualizations are showing different flow aspects and phenomena of the convective boundary layer. All simulations are driven by a constant and horizontally homogeneous surface sensible (and latent) heat flux. The initial state is an atmosphere at rest with neutral stratification, capped by an inversion at about 800m. Simulations differ in domain size and grid resolution.\\ … … 5 5 6 6 7 ||||[=#dustdevil2 '''Dust devils in the convective boundary layer (2012)''']|| 8 {{{#!td style="vertical-align:top; border: 0px solid" 7 == Dust devils in the convective boundary layer (2012) #dustdevil2 8 9 9 {{{#!html 10 10 <iframe width="560" height="315" src="//www.youtube.com/embed/iJIRrk7tKws" frameborder="0" allowfullscreen></iframe> 11 11 }}} 12 }}} 13 {{{#!td style="vertical-align:top; border: 0px solid"" 12 13 '''Project:''' [[imuk/projects/2011_01|Numerical impacts on the strength of simulated dust devils]] \\ 14 \\ 14 15 '''Responsible:''' [[imuk/members/hoffmann|Fabian Hoffmann]], [[imuk/members/maronga|Björn Maronga]]\\ 15 16 \\ 16 '''Project:''' [[imuk/projects/2011_01|Numerical impacts on the strength of simulated dust devils]] \\ 17 \\ 18 '''Description:''' \\ 19 This sequence shows the development of a large dust devil during a time period of 10 minutes. The shown region has a horizontal extent of 350 m x 300 m and is about 300 m high. The dust devil is made visible by a passive scalar which is advected by the flow. The surface flux of the passive scalar is calculated by a simple parametrization of the saltation process which depends on the friction velocity (White, 1979). Due to uncertainties in the parametrization of the surface flux, the displayed concentrations of the passive scalar are in arbitrary units. Dust concentrations in the order of magnitude of 0.1 g/m3 have been found for dust devils in field measurements (Renno et al., 2004). 20 \\ 17 '''Description:''' This sequence shows the development of a large dust devil during a time period of 10 minutes. The shown region has a horizontal extent of 350 m x 300 m and is about 300 m high. The dust devil is made visible by a passive scalar which is advected by the flow. The surface flux of the passive scalar is calculated by a simple parametrization of the saltation process which depends on the friction velocity (White, 1979). Due to uncertainties in the parametrization of the surface flux, the displayed concentrations of the passive scalar are in arbitrary units. Dust concentrations in the order of magnitude of 0.1 g/m3 have been found for dust devils in field measurements (Renno et al., 2004).\\ 21 18 22 19 ||||='''Model Setup''' =|| … … 30 27 ||Visualization software:||VAPOR|| 31 28 ||DOI:||[http://dx.doi.org/10.5446/9352 10.5446/9352]|| 32 }}} 33 \\ 29 30 ---- 34 31 35 32 33 == Structure parameter for temperature C,,T,,^2^ (2010) #structurel0 36 34 37 ||||[=#structurel0 '''Structure parameter for temperature C,,T,,^2^ (2010)''']||38 {{{#!td style="vertical-align:top; border: 0px solid"39 35 {{{#!html 40 36 <embed … … 49 45 /> 50 46 }}} 51 }}} 52 {{{#!td style="vertical-align:top; border: 0px solid"" 47 53 48 '''Project:''' [[imuk/projects/2010_02|High-resolution LES studies of the turbulent structure of the lower atmospheric boundary layer over heterogeneous terrain and implications for the interpretation of scintillometer data]]\\ 54 49 \\ 55 50 '''Responsible:''' [[imuk/members/maronga|Björn Maronga]]\\ 56 51 \\ 57 '''Description:''' \\ 58 This visualization shows the turbulent structure parameter C,,T,,^2^ in the surface layer of a convectively driven boundary layer. Dark colors match to high values up to 0.01, whereas white colors represent lower values down to 0.001. All values which are out of range are set to transparent. Shown is the last half an hour of the simulation. The movie shows, that C,,T,,^2^ is high near the surface, decreasing with height. High values, in comparison with their horizontal environment can be observed in regions where warm air rises upward (plumes). These regions organize in hexagonal cells, which can also be seen in this sequence. Please note that the capping inversion in this simulation was in a height of about 400m.\\ 52 '''Description:''' This visualization shows the turbulent structure parameter C,,T,,^2^ in the surface layer of a convectively driven boundary layer. Dark colors match to high values up to 0.01, whereas white colors represent lower values down to 0.001. All values which are out of range are set to transparent. Shown is the last half an hour of the simulation. The movie shows, that C,,T,,^2^ is high near the surface, decreasing with height. High values, in comparison with their horizontal environment can be observed in regions where warm air rises upward (plumes). These regions organize in hexagonal cells, which can also be seen in this sequence. Please note that the capping inversion in this simulation was in a height of about 400m.\\ 59 53 60 54 ||||='''Model Setup''' =|| … … 67 61 ||Machine/ processor type:||SGI Altix ICE at HLRN / Intel Xeon Gainestown|| 68 62 ||Visualization software:||VAPOR|| 69 \\70 }}}71 63 64 ---- 72 65 73 \\ 74 75 76 ||||='''Horizontal cross-sections (2009)''' =|| 77 {{{#!td style="vertical-align:top; border: 0px solid; width:512px" 66 == Horizontal cross-sections (2009) #crosssect 67 {{{#!td style="vertical-align:top; border: 0px solid" 78 68 {{{#!html 79 69 <embed … … 87 77 flashvars="file=http://palm.muk.uni-hannover.de/chrome/site/gallery/movies/cbl_25fps_flash.flv&image=http://palm.muk.uni-hannover.de/chrome/site/gallery/movies/cbl_preview.jpg" 88 78 /> 89 <br> 79 }}} 80 }}} 81 {{{#!td style="vertical-align:top; border: 0px solid"" 82 {{{#!html 90 83 <embed 91 84 type="application/x-shockwave-flash" … … 100 93 }}} 101 94 }}} 102 {{{#!td style="vertical-align:top; border: 0px solid"" 95 103 96 '''Project:''' [[imuk/projects/2008_05|Numerical Simulation of the interaction between the atmosphere and the wing circulation]]\\ 104 97 \\ 105 98 '''Responsible:''' [[imuk/members/helmke|Carolin Helmke]]\\ 106 99 \\ 107 '''Description:''' \\ 108 Second sequence:\\ 109 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.\\ 110 \\ 111 Third sequence:\\ 112 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). 100 '''Description:''' First 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.\\ 101 102 Second sequence: The simulation and particle features are the same as for the first 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).\\ 103 113 104 ||||='''Model Setup''' =|| 114 105 ||Total domain size (x|y|z):||4096.0m x 4096.0m x 1859.7m|| … … 127 118 ||Flash (.flv) || 3.1mb||[[htdocs:gallery/movies/cbl2_25fps_flash.flv|Download]] (3nd Sequence) || 128 119 ||MPEG (.avi) || 3.1mb||[[htdocs:gallery/movies/cbl2_25fps_mpeg.avi|Download]] (3rd Sequence) || 129 \\130 }}}131 120 121 ---- 132 122 133 \\ 123 == Dust devils (2006) #dustdevil1 134 124 135 136 ||||='''Dust devils (2006)''' =||137 {{{#!td style="vertical-align:top; border: 0px solid"138 125 {{{#!html 139 126 <embed … … 148 135 /> 149 136 }}} 150 }}} 151 {{{#!td style="vertical-align:top; border: 0px solid"" 137 152 138 '''Project:''' [[imuk/projects/2006_02|LES of dust devils]]\\ 153 139 \\ 154 140 '''Responsible:''' [[imuk/members/franke|Theres Riechelmann]]\\ 155 141 \\ 156 '''Description:''' \\157 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. 142 '''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.\\ 143 158 144 ||||='''Model Setup''' =|| 159 145 ||Total domain size (x|y|z):||768m x 768m x 768m|| … … 170 156 ||Flash (.flv) || 9.6mb||[[htdocs:gallery/movies/dust_devil.flv|Download]] || 171 157 ||MPEG (.avi) || 9.7mb||[[htdocs:gallery/movies/dust_devil.avi|Download]] || 172 \\173 }}}174 158 159 ---- 175 160 176 \\ 161 == 3D view on moist convection (2001) #moistconv 177 162 178 ||||='''3D view on moist convection (2001)''' =||179 {{{#!td style="vertical-align:top; border: 0px solid"180 163 {{{#!html 181 164 <embed … … 190 173 /> 191 174 }}} 192 }}} 193 {{{#!td style="vertical-align:top; border: 0px solid"" 175 194 176 '''Project:''' none\\ 195 177 \\ … … 197 179 \\ 198 180 '''Description:''' Particles are released near the surface. 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. The isososurfaces display areas with a liquid water content larger than 0.2 g/kg, i.e. cumulus clouds. The horizontal domain size in this simulation is too small in order to allow the development of the typical near-surface hexagonal flow pattern (see next two sequences).\\ 181 199 182 ||||='''Model Setup''' =|| 200 183 ||Total domain size (x|y|z):||2000m x 2000m x 4638m|| … … 211 194 ||Flash (.flv) || 9.6mb||[[htdocs:gallery/movies/cbl5.flv|Download]] || 212 195 ||MPEG (.avi) || 9.7mb||[[htdocs:gallery/movies/cbl5.avi|Download]] || 213 \\214 }}}215 196 197 ----
