For convection to occur, the absolute value of the actual temperature gradient has to be larger than the absolute value of the adiabatic temperature gradient (|dT/dr|act > |dT/dr|ad).
Tuesday, 30 October 2012
Temperature Gradient Problems
For convection to occur, the absolute value of the actual temperature gradient has to be larger than the absolute value of the adiabatic temperature gradient (|dT/dr|act > |dT/dr|ad).
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Hmm... Looking at the plot of T vs. R for the static model, it does not seem to match your temperature gradient plot here. Just estimating by eye, I think the gradient should go "small -> large -> slightly smaller -> a lot larger"
ReplyDeleteBut here it seems to drop a lot. as it gets toward the surface.
How are you calculating the gradient?
You may not be able to assume equal spacing between distance points. Also, you may need to reduce the resolution of the temperature, distance arrays, as it looks like you are getting a lot of numerical noise at low radii.