Thunderhead Engineering Forum

Please login or register.

Login with username, password and session length
Advanced search  


Forum moved to

Author Topic: Sun modelling  (Read 641 times)


  • New Member
  • *
  • Posts: 1
    • View Profile
Sun modelling
« on: February 11, 2020, 11:25:15 am »

Hello everyone,
I'm new using this program and I'm using it for my Master thesis related with the study of "heat island effect" in cities. I would like to know if you have any idea to create a sun movement across the day simulation. When the sun rises up till the sunset, in real time and with the radiation characteristics.
Any idea about the topic or the sun simulation is more than welcome!
Thank you very much.

Dave McGill

  • Member
  • ***
  • Posts: 166
    • View Profile
Re: Sun modelling
« Reply #1 on: April 11, 2020, 02:17:03 pm »

Here's a rather kludgy method.

You could have a series of vents (hot surfaces) on the perimeter on your domain, running up the east wall, across the top and down the west wall, that were timed to activate and deactivate as the model progressed. Radiation from the sun is ~ 1 k/m^2 at ground level (don't quote me), so you would have to calibrate the temperature of the vents to create the desired flux at ground level.

You should also increase the number of solid angles to get a more refined calculation of the radiative flux.

It would take weeks to simulate 12 hours of real time.

« Last Edit: April 12, 2020, 07:54:03 am by Dave McGill »
Dave McGill