Hallo
I have been using lateral open boundaries in version 3 of WRF.
I solved a problem related to reflection of gravity waves propagating horizontally. The waves reflect off the lateral open boundaries. (The "gravity-wave radiating" condition does not prevent this, even when I adjust the prescribed wave-speed to match that for the stability.)
The fix I found was to impose a sponge on the five grid-points nearest the open boundary (in pbl driver) with relaxation of potential temperature towards its average over the 25% of the domain along the boundary.
The spurious lines of cloud caused by standing waves now disappear. The fix works well.
I can contribute code if you are interested.
Vaughan
I have been using lateral open boundaries in version 3 of WRF.
I solved a problem related to reflection of gravity waves propagating horizontally. The waves reflect off the lateral open boundaries. (The "gravity-wave radiating" condition does not prevent this, even when I adjust the prescribed wave-speed to match that for the stability.)
The fix I found was to impose a sponge on the five grid-points nearest the open boundary (in pbl driver) with relaxation of potential temperature towards its average over the 25% of the domain along the boundary.
The spurious lines of cloud caused by standing waves now disappear. The fix works well.
I can contribute code if you are interested.
Vaughan