Changes between Version 30 and Version 31 of GravoTurbulence

Timestamp:

12/12/11 12:17:54 (13 years ago)

Author:

Jonathan

Comment:

—

GravoTurbulence

@@ -10 +10 @@
   * Magnetically critical clouds
 
+
+
+Some of the following simulations are done in 2D using sink 'cylinders'... 
+
+||  ||  2D  ||  3D  ||
+||  Force  ||  [[latex($-2/r$)]]  ||  [[latex($-1/r^2$)]]  || 
+||  Potential  ||  [[latex($2 \log(r/C)$)]]  ||  [[latex($-1/r+0$)]]  ||
+||  Mass  ||  [[latex($\pi r^2$)]]  ||   [[latex($\frac{4}{3}\pi r^3$)]]   ||
+||  Energy of a uniform 'sphere'  ||  [[latex($GM^2(\log(r/C)-1/4)$)]] ||  [[latex($-\frac{3 G M^2}{5 r}$)]]  ||
+
+Obviously to determine whether systems are 'bound' one needs a way to calculate the self-gravitational energy.  This requires determining an appropriate constant [[latex($C$)]]  
 
 == Density Perturbations ==
@@ -407 +418 @@
 Note that [[latex($nB >= B >= 1-n+B$)]] for [[latex($n >= 1 \mbox{ and } B >> 0$)]] so [[latex($f >= 1$)]] which does not allow for any solutions of interest.  But that shouldn't stop us from trying a setup in 2D using the radii for 3D.  Things should just be more collapsible - but there should still be a hierarchical collapse
 
+=== VIII ===
+||  VIII  ||
+||  [[Image(GravoTurb_rho0000.png, width=400)]]  ||
 ||  [attachment:GravoTurb_rho.gif movie]  ||
-||  [[Image(GravoTurb_rho0000.png, width=400)]]  ||
-
 and a whole lot of sink particles.  Here there is no gradient based refinement - just 4 cells per jeans length...
  
@@ -432 +444 @@
 ||  [attachment:LargeScaleDriving.gif movie]  ||
 
-And here is a movie showing cloud temperature early on.  You can see the dense filaments cool to 10K.
+And here is a still showing cloud temperature early on.  You can see the dense filaments cool to 10K.
 ||  VI   || 
 ||  [[Image(2DCloudTemp.png, width=400)]]  ||
+
+
+
+=== VII ===
+
+We also tried starting with a cloud with several jeans lengths of material and with a small velocity perturbation to see if that could seed gravo-turbulence...
+
+|| rho  ||  1  ||
+|| temp ||  10  ||
+|| EOS  || Isothermal ||
+|| Jeans Length || 23.546 pc ||
+|| Cloud Diameter || 80 pc ||
+|| # of Jeans Masses || 9.06 ||
+|| Free fall time || 35 Myr ||
+
+
+||  VII  ||
+||  [[Image(2D_ss_rho0015.png, width=400)]]  ||
+||  [attachment:2D_ss_rho.gif movie]  ||
+