stormchasegenie
Member
Greetings,
I am trying to dampen boundary artifacts in my inner nest that are originating due to the fact that my one-way nest's southern boundary intersects with complex orographic features (it cannot be helped).
As such, I changed my spec_bdy_width from 5 to 10 points, increasing my relax zone from 4 to 7 and my spec_zone from 1 to 3. This helped a lot in reducing boundary artifacts that were quite intrusive to the nest's interior.
To understand what is happening, I ran an additional test in which spec_bdy_width = 10, but now spec_zone and relax_zone = 1 and 9 respectively. I got the exact same result as the previous experiment (relax_zone = 7, spec_zone = 3). This should not be the case with linear damping of the LBCs following Davies and Turner (1977), as the weights should be changed between the experiments. I am using wrfinput* files in ndown, which uses spec_bdy_width = 5, relax_zone = 4, and spec_zone = 1, but this shouldn't matter.
Thoughts?
Thanks,
-Stefan
I am trying to dampen boundary artifacts in my inner nest that are originating due to the fact that my one-way nest's southern boundary intersects with complex orographic features (it cannot be helped).
As such, I changed my spec_bdy_width from 5 to 10 points, increasing my relax zone from 4 to 7 and my spec_zone from 1 to 3. This helped a lot in reducing boundary artifacts that were quite intrusive to the nest's interior.
To understand what is happening, I ran an additional test in which spec_bdy_width = 10, but now spec_zone and relax_zone = 1 and 9 respectively. I got the exact same result as the previous experiment (relax_zone = 7, spec_zone = 3). This should not be the case with linear damping of the LBCs following Davies and Turner (1977), as the weights should be changed between the experiments. I am using wrfinput* files in ndown, which uses spec_bdy_width = 5, relax_zone = 4, and spec_zone = 1, but this shouldn't matter.
Thoughts?
Thanks,
-Stefan