Search found 9 matches

by wsr
May 23rd, 2019, 4:18 pm
Forum: Bugs
Topic: PARDSP causing NaN particle trajectories in PARDUMPs
Replies: 1
Views: 2128

PARDSP causing NaN particle trajectories in PARDUMPs

ISSUE: NaNs generated for Hysplit dispersion particle trajectories CONTEXT: When running the Hysplit dispersion model, some of the PARDUMP particle elevations showed up as NaNs. In tracking this down, it appears that elements of the ZPOS vector were NaN's and those NaNs originate in the pardsp.f rou...
by wsr
November 12th, 2018, 7:15 pm
Forum: Dispersion Model
Topic: Release height/top of domain ignored?
Replies: 2
Views: 1440

Release height/top of domain ignored?

The attached vert_dist_1.png and vert_dist_2.png are a couple pictures illustrating initial and final particle heights for a 1-hour Hysplit (v984) concentration simulation. Abridged CONTROL and SETUP files for this simulation are attached as .txt as well. vert_dist_1.png vert_dist_2.png Each image s...
by wsr
October 8th, 2018, 6:03 pm
Forum: Dispersion Model
Topic: What is SORT-INDEX in the PARDUMP format?
Replies: 1
Views: 1261

What is SORT-INDEX in the PARDUMP format?

The particle output parameter SORT-INDEX does not appear to be described in the Hysplit user guide. Can anyone state definitively what SORT-INDEX represents for each particle and how it is used, specifically in a multi-processor run?
by wsr
October 1st, 2018, 8:59 pm
Forum: Dispersion Model
Topic: Extract particle path (start/stop) information
Replies: 4
Views: 2941

Extract particle path (start/stop) information

I am running the dispersion model in a multi-processor environment. I am interested in the particle path time series that Hysplit generates. I do not need the entire path, but I need to be able to associate the initial condition with the final location listed in, say, a PARDUMP file. The problem I a...
by wsr
August 25th, 2018, 8:13 pm
Forum: Dispersion Model
Topic: MAXPAR/NUMPAR upper limit
Replies: 7
Views: 5369

Re: MAXPAR/NUMPAR upper limit

I am not sure this question was answered. This would be helpful for those like me who find it later and actually need a definitive answer on the largest MAXPAR/NUMPAR that can be used. In particular, I soon will need to set up a run of ~1E9 particles at any given model time step. With the variety of...
by wsr
July 23rd, 2018, 3:32 pm
Forum: Dispersion Model
Topic: Changing random number generator seed
Replies: 2
Views: 2415

Changing random number generator seed

I have a question about the turbulence calculations in dispersion simulations. In the user guide, I have found no reference to random number generator (RNG) seed modulation, including no option to change or modulate the RNG seed in the turbulence term of the dispersion simulations. I figure I have m...
by wsr
September 4th, 2017, 9:46 am
Forum: Bugs
Topic: Inconsistent behavior in radius plot option
Replies: 1
Views: 4075

Inconsistent behavior in radius plot option

I am running Hysplit-4 on a Win 10 PC, so this bug needs to be verified on a Win 7 PC. I needed to plot contours of the velocity components in the WRF09 and WRF27 tutorial datasets, centered at the Lat/Lon 39.90/-84.22, with a radius less than the full extent of the data. However, the plots did not ...
by wsr
August 29th, 2017, 10:47 pm
Forum: Users
Topic: Tutorial files location
Replies: 3
Views: 2361

Re: Tutorial files location

Perhaps I am missing something, but I see only the tutorial text available from your link (as well as a forbidden link). There is no repository for files actually used in the tutorials, just as there is no "\Tutorials" directory in the installation. However, the tutorial constantly references this d...
by wsr
August 23rd, 2017, 12:22 am
Forum: Users
Topic: Tutorial files location
Replies: 3
Views: 2361

Tutorial files location

After installing Hysplit 4 (public) on a PC running Windows 10, the trajectory and concentration demos run without error. However, there is no \Tutorial directory, and it may be impossible to proceed with the tutorial if any the tutorial files are not embedded in the tutorial webpage. Where are thes...