DPM transient laminar flow over a cylinder

JSoares · April 12, 2011, 00:40

Hello everyone

I´m trying a simple case:

A flow over a cylinder at Re=80, with unsteady formulation.
I turned radiation scheme "do", so that the cylinder send radiation.
Then i inject particles to measure uv radiation that every particle had received.

I´ve doubts and problems:

1- Should i turn on dpm after the flow and radiation convergence or should turn before any simulation.
2- I inject particles from a surface "inlet" and i didn´t change start and stop time. should ?. The problem is that if i check unsteady particle track it happens nothing (literally), but if i uncheck that optinon i can mesure radiation i every particle. i don´t understand waht i´m doing wrong.

Notice that I have and udf implmented that mesure this quantities and works real fine.

In advance thanks.

tirtha · April 12, 2011, 03:37

hi
once you will use dpm , i guess you have to give ESCAPE condition on the "inlet" and "outlet"
try to give a certain start and stop time and see whether your getting any particles inside your geometry.

im not sure but it may help,

tirtha

April 12, 2011, 00:40	DPM transient laminar flow over a cylinder	#1
JSoares New Member Join Date: Feb 2011 Posts: 16 Rep Power: 15	Hello everyone I´m trying a simple case: A flow over a cylinder at Re=80, with unsteady formulation. I turned radiation scheme "do", so that the cylinder send radiation. Then i inject particles to measure uv radiation that every particle had received. I´ve doubts and problems: 1- Should i turn on dpm after the flow and radiation convergence or should turn before any simulation. 2- I inject particles from a surface "inlet" and i didn´t change start and stop time. should ?. The problem is that if i check unsteady particle track it happens nothing (literally), but if i uncheck that optinon i can mesure radiation i every particle. i don´t understand waht i´m doing wrong. Notice that I have and udf implmented that mesure this quantities and works real fine. In advance thanks.

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April 12, 2011, 03:37		#2
tirtha New Member tirtha Join Date: Mar 2011 Posts: 11 Rep Power: 15	hi once you will use dpm , i guess you have to give ESCAPE condition on the "inlet" and "outlet" try to give a certain start and stop time and see whether your getting any particles inside your geometry. im not sure but it may help, tirtha