Changes between Version 23 and Version 24 of u/BonnorEbertMatched
- Timestamp:
- 06/16/12 21:22:25 (13 years ago)
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u/BonnorEbertMatched
v23 v24 15 15 '''Results:''' 16 16 17 Note the line marking 'dx' denotes the size of the smallest cells in the grid, those within the BE sphere's center most regions (dx~0.06). The cells outside a radius of 150% Rbe (radius of BE sphere), however, made up the coarsest level grid (see below movies of the mesh) and had dx~1.62 pc for smaller grid and dx~3 for larger grid. The last time frame of data included in these plots and the movies below is the time before the collapse was no longer resolved adequately with the refinement criteria used. Since the aim of this study was to look at the initialization of the collapse, the refinement used here was sufficient. The time in which the sphere collapsed was on the order of 1 crossing time, tsc=3.84 myr.17 Note the line marking 'dx' denotes the size of the smallest cells in the grid, those within the BE sphere's center most regions (dx~0.06). The cells outside a radius of 150% Rbe (radius of BE sphere), however, made up the coarsest level grid (see below movies of the mesh) and had dx~1.62 pc for smaller grid and dx~3 for larger grid. The last time frame of data included in these plots and the movies below is the time before the collapse was no longer resolved adequately with the refinement criteria used. Since the aim of this study was to look at the initialization of the collapse, the refinement used here was sufficient. The time in which the sphere's P(Rbe) > Pcrit was t~0.15 myr, ~ 4% of a crossing time (and how much of the free fall time?). 18 18 19 19 :[[Image(vrad.png, 45%)]] [[Image(VradM.png, 45%)]] 20 20 :[[Image(rho.png, 47%)]] [[Image(rhoM.png, 43%)]] 21 21 22 The horizontal line in the following plots is the value of Pcrit, where Pcrit~1.14 Cs^8^/G^3^*M^2^ and characterizes the maximum external pressure a critical BE sphere can withstand before collapsing. Note that both the thermal and ram pressure at the Bonnor Ebert surface, Rbe, is BELOW the threshold under light ambient medium conditions, whereas in the "matched" ambient medium case both of these pressures EXCEED the threshold. (I suppose then that an adequate time to describe the collapse may be when the P>Pcrit?-- which is EARLY on according to this data..?).22 The horizontal line in the following plots is the value of Pcrit, where Pcrit~1.14 Cs^8^/G^3^*M^2^ and characterizes the maximum external pressure a critical BE sphere can withstand before collapsing. Note that both the thermal and ram pressure at the Bonnor Ebert surface, Rbe, is BELOW the threshold under light ambient medium conditions, whereas in the "matched" ambient medium case both of these pressures EXCEED the threshold. 23 23 24 24 :[[Image(ThermalP.png, 47%)]] [[Image(thermalPM.png, 43%)]] … … 31 31 '''Mesh''' 32 32 33 The movies shown below are just of the time frames up until the collapse in the matched case became poorly resolved. To see extended version of the sphere in the light ambient, follow the link below. 34 33 35 :[[Image(meshCroppedLight.gif, 35%)]][[Image(meshMatchedCropped.gif, 35%)]] 34 36 … … 40 42 41 43 42 '''Issues - link here'''43 44 [https://clover.pas.rochester.edu/trac/astrobear/wiki/u/BEmoviesLonger here]45 46 47 44 '''Discussion''' 48 45 49 -size differences, computational difficulties 46 -size differences, computational difficulties, etc. 47 -[https://clover.pas.rochester.edu/trac/astrobear/wiki/u/BEmoviesLonger here]
