WUFI

Hello,

I have reviewed the discussions related to drainage modeling in the built-ups and gained an understanding that a sink can be used to remove water from the cavity. To accurately determine the appropriate amount of water to be removed, I followed this specific procedure:

Initially, I conducted a simulation without any drainage and exported the water content [in kg/m³] from the results. Next, I adjusted the water content results by multiplying them by the thickness of the cavity and dividing them by 60, to achieve the water content in [kg/m²s]. Then , I multiplied them to "-1" and saved the file as a text . Finally, I assigned the ".txt" file as the transient input in the sink settings.

While I have observed that the water content of the cavity is 0 during the simulated period and the cavity is being effectively drained, I have some concerns about the acceptability of this procedure and whether it may yield unrealistic results.

p.s.
no convergence failures= 0
balance 1= -3.6
balance 2= -4

May i ask if there is any update or response to this post? Still wondering if this is a proper procedure to assume that all the water penetration from the exterior side will be drained from the cavity?
thank you in advance

Hi Morteza,
in my eyes thats a good way to simulate the running off process of dew water. Only thing is, that in reality not the wohle water will run off. There will remain a layer of drops on the inner surfaces of the cavity. According to the EN 13788 there can be 200g/m² before the water starts to run of.. Some other standards also include other values. See also this tutorial:
https://wufi.de/en/service/downloads#co ... assessment
Christian