Nesting in WRF with Vertical Grid Refinement and Implicit Relaxation
نویسنده
چکیده
We present results using WRF Version 3.1 with modifications to allow for nesting with vertical grid refinement. A new switch that controls the vertical refinement factor is added to the namelist. The program ndown is modified so that when this switch is greater than 1, a high order monotonic interpolation is activated in the vertical. The fields are rebalanced to minimize the generation of transients due to the interpolation. The outputs from ndown are then used as input to WRF with higher vertical dimension depending on the vertical refinement factor. Simulations using nesting in WRF with vertical grid refinement for real atmospheric conditions are presented. We also present a new relaxation technique at the lateral boundaries based on implicit corrections implemented in the acoustic time step. Simulations are conducted to test the performance of the implicit relaxation method. The results are compared with the explicit relaxation. These tests demonstrate that the implicit relaxation is very effective and robust.
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