WUFI

At a certain time step of the calculation, only one iteration is performed and theta and phi are then constantly at 0. The moisture content in the material makes a jump at this point and remains at saturation humidity.


Its a roof construction with insulation between rafters. With Wufi 1D and the same climate conditions I got reasonable results.

What might that be? What settings can I change to get reasonable results with Wufi 2D?

Hello,
first try to change Computational Settings -> Enhanced URF for RH from 0.7 to 0.3. That decouples the solution of the temperature and the relative humidity and leads to an easier solution of the equations and a better convergence. You can set that as an default, because the default value is quite old, we found out that the solution is easier with 0.3.

If this doesn´t help, please see here, if you can find something useful:
http://www.wufi-forum.com/WUFIForum/vie ... 1354#p1354
http://www.wufi-forum.com/WUFIForum/vie ... 2190#p2190

Christian