splashwater from driving rain

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red-wufi-luc
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splashwater from driving rain

Post by red-wufi-luc » Mon Jan 02, 2023 10:20 pm -1100

Is there any option existing to allow splashwater from driving rain (from the ground up to 70cm) to get in the simulation condition in WUFI? When it is able, how can this condition be realized in WUFI?

Thomas
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Re: splashwater from driving rain

Post by Thomas » Tue Jan 10, 2023 10:00 pm -1100

Hi red-wufi-luc,

since the amount of splashwater will be roughly proportional to the amount of driving rain, you can simply increase the amount of driving rain by an appropriate factor.

This can be done by increasing the "adhering fraction of rain" in the dialog for the surface transfer coefficients. This is simply a factor with which the estimated amount of driving rain is multiplied to take into account that some rain is usually splashing off when hitting the surface. For a vertical surface the default value is 0.7 (i.e. about 30 % of the rain hitting the surface is splashing off and is not available for uptake by the wall). You can increase this value by a factor which takes water splashing onto the surface into account. WUFI allows values up to 2. (For values greater than 1 it will issue a warning at the start of the calculation, but this is only a warning about an unusual value, not an error message).

Another option is to increase the factor R2 in the driving rain model (dialog "Orientation").

Kind regards,
Thomas

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