Changes between Version 7 and Version 8 of u/erica/scratch4

Timestamp:

02/16/16 17:25:31 (9 years ago)

Author:

Erica Kaminski

Comment:

—

u/erica/scratch4

@@ -3 +3 @@
 = Radiation feedback from sink particles =
 
-The amount of thermal radiation produced in the grid is a function of temperature. Since sinks are a subgrid model they themselves do not have temperature (we are not sure how big the forming star is, how fast it is growing by contraction, etc., so there isn't an easy way of assigning the sub-grid object a 'temperature'). Similarly, we do not keep track of the amount of energy that falls onto the sink particle. Thus, we are left to assume gas that is accreted by surrounding zones contribute to the accretion luminosity of the forming protostar, and thus we need a way to estimate this accretion luminosity.   
+The amount of thermal radiation produced in the grid is a function of temperature. Since sinks are a subgrid model they themselves do not have temperature (we are not sure how big the forming star is, how fast it is growing by contraction, etc., so there isn't an easy way of assigning the sub-grid object a 'temperature'). Thus, we are left to estimate the amount of radiation produced by the sink by its accretion luminosity. 
 
-Thus, we will prescribe some fraction of infalling energy to be recycled back into the grid. We will have this ''accretion energy'' ([[latex($E_{acc}$)]]) distributed smoothly in a kernel surrounding the sink, so that it diffuses away back into the grid via FLD radiative transfer. In this way, sinks will act as additional sources of radiation within the grid. The kernel of cells surrounding each sink will be stepped on each radiative time-step with the values of [[latex($E_{acc}$)]] computed for that time-step.
+Since we do not track energy accretion onto the sink, we are left to assume gas that is accreted from the surrounding zones contribute to the accretion luminosity of the forming protostar, and thus we need a way to estimate this accretion luminosity. To do this, we will recycle some fraction of infalling energy back into the grid. This ''accretion energy'' ([[latex($E_{acc}$)]]) will be distributed smoothly in a kernel surrounding the sink every time step. It will then diffuse away from the sink via FLD radiative transfer. In this way, sinks will act as additional sources of radiation within the grid. 
+
 
 = Accretion Luminosity =