Changes between Version 2 and Version 3 of u/massBElight

Timestamp:

10/05/12 16:59:38 (13 years ago)

Author:

Erica Kaminski

Comment:

—

u/massBElight

@@ -1 +1 @@
 === Tracking the mass that falls onto the BE sphere === 
 
-I would like to calculate the mass that falls onto a BE sphere from the ambient over the course of a simulation. There may be a few ways to do this, but easiest may be what came to mind today: find M(t) using Visit's query option for total mass in box. 
+I would like to calculate the mass that falls onto a shell of dr=0.1RBe at r=Rbe from the ambient over the course of a simulation. There may be a few ways to do this, but easiest may be what came to mind today: find M(t) of the sphere with r=1.1Rbe, using Visit's query option for total mass in box. 
 
 ==== The method ==== 
 
-First, I had to determine the right sum to use in visit. I see that the 'query' option had 2 sums: weighted and not. Additionally, the sum query is for the current plot. If that plot is a slice of the full simulation, the query will return only a sum of variables from that slice's mesh.  
+First, I had to determine the right sum to use in Visit. I see that the 'query' option had 2 sums: weighted and not. Additionally, I found that the sum query is for the current plot. If that plot is a slice of the full simulation, the query will return only a sum of variables from that slice's mesh. Using my knowledge of the BE sphere's total mass from my simulation output --- that is, 151 solar mass, I calculated the mass of the ambient quite easily, given the ambient is of uniform density:
+
+{{{#!latex
+Mamb = (30.4 - {4 \over 3}* \pi * Rbe^3^ 
+}}}
+
+Putting this into computational units, I discovered that '''weighted variable sum''' was the correct query to get the total rho/cell (and hence mass) in the grid.
+
+The plan was to calculate M(t, 1.1Rbe) using the following formula:
+
+{{{#!latex
+M(t) = 
+}}}
+
+