Search found 33 matches

by BAN
Tue Feb 05, 2019 2:24 pm
Forum: ROMS Problems
Topic: RIP currents
Replies: 1
Views: 375

RIP currents

Hi
I have previously used ROMS for tidal modelling and SWAN for wave modelling. Now I would like to combine these two and model rip currents. Where can I find information or a relevant test case?
by BAN
Tue Mar 29, 2011 9:02 am
Forum: ROMS Discussion
Topic: Spatially varying bottom friction
Replies: 1
Views: 1072

Spatially varying bottom friction

I'm a happy user of the new spatially varying bottom friction. This option will make it possible to get better agreement between tidal simulations and measurements. . . but this option is also suited to simulate 2D current energy drain in specific areas e.g. simulating the effect of a tidal stream f...
by BAN
Mon Mar 14, 2011 11:40 am
Forum: ROMS Problems
Topic: East-west tidal currents issue
Replies: 7
Views: 2346

Re: East-west tidal currents issue

The tabulated results will be fine, but a plot of the model domain and measurement locations would make the picture clearer. What I did was to save current and surface every hour via his files, convert into time series, run t_tide on all model points i.e. I have tidal constituents in all model point...
by BAN
Mon Feb 28, 2011 4:51 pm
Forum: ROMS Problems
Topic: East-west tidal currents issue
Replies: 7
Views: 2346

Re: East-west tidal currents issue

Hi I use a quite similar setup, and also use OTPS forcing. I observed that including currents gave a clear deviation from the forcing already at the model boundary, whereas the reduced physics option gave better fit with the forcing. I tried out some alternatives to FSCHAPMAN/M2FLATHER but the resul...
by BAN
Thu Feb 24, 2011 1:52 pm
Forum: ROMS Problems
Topic: Can VISC2 be scaled by depth?
Replies: 1
Views: 1538

Can VISC2 be scaled by depth?

In his review ‘On Charting Global Ocean Tides’ (Reviews of Geophysics and space physics, Vol 18, No. 1, pages 243-268, 1980) Schwiderski argues that the lateral eddy viscosity is best represented if it is dependent on mesh size and depth . My present understanding of horizontal viscosity in ROMS is ...
by BAN
Wed Jan 12, 2011 4:56 pm
Forum: ROMS Problems
Topic: Intel’s new i7 980x CPU gives disappointing speedup
Replies: 48
Views: 22239

Re: Intel’s new i7 980x CPU gives disappointing speedup

Running Soliton with default stack size (8192kbytes) is no problem. The problem with large stack sizes is only with my other applications. Just to be on the safe side I reran some of the cases reported above with default stack size, which were executed with unlimited stack size. There was no clear d...
by BAN
Mon Jan 10, 2011 7:19 pm
Forum: ROMS Problems
Topic: Intel’s new i7 980x CPU gives disappointing speedup
Replies: 48
Views: 22239

Re: Intel’s new i7 980x CPU gives disappointing speedup

That was just it. I did not use make clean between make mpc and make -j. Here are some run-times from running soliton on ROMS_1.9 NSUB_X 6 6 8 8 8 9 3 12 12 12 NSUB_E 32 64 24 36 48 32 32 32 24 48 12treads 31.2 29.6 31.4 30.4 29.4 29.6 36.4 27.8 25.6 27.2 6 treads 28.6 26.8 26.6 25.8 38.6 24.4 34.4 ...
by BAN
Mon Jan 10, 2011 4:15 pm
Forum: ROMS Problems
Topic: Intel’s new i7 980x CPU gives disappointing speedup
Replies: 48
Views: 22239

Re: Intel’s new i7 980x CPU gives disappointing speedup

Hi here is a update, with some surprises starting with the last post: I agree, 8 treads is far from optimal and I just included this as it gave a “semi-comparable” reference time to the 8 treaded run-time you reported. tilling 8x24 takes 38.6 sec with 12 treads and a surprise tilling 12x32 takes 37....
by BAN
Thu Jan 06, 2011 3:00 pm
Forum: ROMS Problems
Topic: Intel’s new i7 980x CPU gives disappointing speedup
Replies: 48
Views: 22239

Re: Intel’s new i7 980x CPU gives disappointing speedup

Answer to 2: Running with FFLAGS := -no-heap-arrays -fp-model precise -openmp -fpp -ip -O3 - axSSE4.2 -free and increased stack size (16384) using same tilling (6 x 32) on : 12 treads the time was: 39 sec. 8 treads the time was: 44 sec. Running with FFLAGS := : -pc80 -xSSE4.2 -auto -stack_temps -op...
by BAN
Thu Dec 30, 2010 9:55 pm
Forum: ROMS Problems
Topic: Intel’s new i7 980x CPU gives disappointing speedup
Replies: 48
Views: 22239

Re: Intel’s new i7 980x CPU gives disappointing speedup

Hi, and once again sorry for the long time elapse. Tonight I unfortunately only had time to test the first part of what you suggested. The rest will come later. To begin at the end I'm most grateful for the help and guidance you have already provided, and relative to where I began the simulations ar...
by BAN
Thu Dec 30, 2010 5:34 pm
Forum: ROMS Problems
Topic: Results and issues of barotropic tidal run
Replies: 14
Views: 5066

Re: Results and issues of barotropic tidal run

Hi again, It is a long time since I last visited the forum. Here is a short update. I tried out FES2004, and tried a lot of different model options, long time runs, fewer constituents etc. but the problem related to the unrealistically high O1 current speed north of the islands remained. The procedu...
by BAN
Thu Dec 30, 2010 4:28 pm
Forum: ROMS Problems
Topic: tidal model problem
Replies: 1
Views: 1455

Re: tidal model problem

Hi Regarding nodal factor etc. it is as remember it accounted for in preprocessing, and is therefore not needed within the model. See https://www.myroms.org/wiki/index.php/Tidal_Forcing and the check out the code on http://marine.rutgers.edu/~hunter/roms/tides/otps/ You seem to run in 2D Here are so...
by BAN
Mon Nov 08, 2010 7:18 pm
Forum: ROMS Problems
Topic: Intel’s new i7 980x CPU gives disappointing speedup
Replies: 48
Views: 22239

Re: Intel’s new i7 980x CPU gives disappointing speedup

Once again thank you for the valuable advice, and I apologize for the long time elapse. I’ve tried some different tilling options and as I understand the tilling partition in ROMS almost anything goes as long as the total number (NtileI * NtileJ) is a multiple of the number of treads (in my case 12)...
by BAN
Wed Sep 29, 2010 12:50 pm
Forum: ROMS Problems
Topic: Intel’s new i7 980x CPU gives disappointing speedup
Replies: 48
Views: 22239

Re: Intel’s new i7 980x CPU gives disappointing speedup

Hi again shchepet and thank you for your advice, which so far have given surprisingly high performance gains. QUESTION: where does the 8x81 tiling come from, memory configurations? So far I’ve been thinking the tiling should correspond to the number of cores/treads on the PC/Cluster but apparently I...
by BAN
Mon Sep 27, 2010 3:04 pm
Forum: ROMS Problems
Topic: Intel’s new i7 980x CPU gives disappointing speedup
Replies: 48
Views: 22239

Re: Intel’s new i7 980x CPU gives disappointing speedup

Hi again, and thank you all for the interest and comments To answer the questions from one end: It appears that I’m using ROMS svn 511. - I’ll follow the suggestion by subsonic and update the code. Grid size: 1398 x 726 x 1 Tilling: is 3 x 2 Regarding the BIOS settings, I haven’t done anything at al...
by BAN
Mon Sep 20, 2010 10:44 am
Forum: ROMS Problems
Topic: Intel’s new i7 980x CPU gives disappointing speedup
Replies: 48
Views: 22239

Re: Intel’s new i7 980x CPU gives disappointing speedup

Hi Alex I first ran it using MPI on an old small Linux cluster that the University owns (five Dell 2600 2.6-GHz Xeon servers with a total of 10 dual core CPUs). When the cluster recently stopped working I tried to run the application in OpenMP mode on my Ubuntu i7 930 PC. To my surprise the 4-core P...
by BAN
Thu Sep 16, 2010 11:40 am
Forum: ROMS Problems
Topic: Intel’s new i7 980x CPU gives disappointing speedup
Replies: 48
Views: 22239

Re: Intel’s new i7 980x CPU gives disappointing speedup

Hi Kate and ocecept, and thank you for your quick replies. As you agree that the memory bandwidth is an important issue, I’ll make the relative modest investment and purchase the faster RAM. The present model domain is not ideal for parallel tiling; it was initially derived for a serial Fortran77 ap...
by BAN
Wed Sep 15, 2010 1:56 pm
Forum: ROMS Problems
Topic: Intel’s new i7 980x CPU gives disappointing speedup
Replies: 48
Views: 22239

Intel’s new i7 980x CPU gives disappointing speedup

Hi I have been running ROMS on a pc with an i7 930 CPU (4 core, 2.80GHz, 64 bit, triple channel DDR3 1333MHz RAM). The operating system is the 64-bit version of Ubuntu 10.04 (lucid). Now I tried to run ROMS on an equivalent pc but with an i7 980x CPU (6 core, 3.33GHz) which is the present flagship f...
by BAN
Fri Sep 10, 2010 6:44 am
Forum: ROMS Problems
Topic: Results and issues of barotropic tidal run
Replies: 14
Views: 5066

Re: Results and issues of barotropic tidal run

Thank you for the suggestion Ed.
I’ll look into it right away.
by BAN
Thu Sep 09, 2010 4:44 pm
Forum: ROMS Problems
Topic: Results and issues of barotropic tidal run
Replies: 14
Views: 5066

Re: Results and issues of barotropic tidal run

Thank you for your remarks and questions John and leonjld Re: John - I’ll make longer time simulations later on, but I'm not sure this will make a big difference. Re: leonjld - As you can see below in Figure 3 the O1 overshoot is also present in OSU forcing data (green line is forcing, red is ROMS a...
by BAN
Mon Aug 30, 2010 1:14 pm
Forum: ROMS Problems
Topic: Results and issues of barotropic tidal run
Replies: 14
Views: 5066

Re: Results and issues of barotropic tidal run

Thank you for the interest rmueller Yes the depth at ADCP locations and the corresponding depth of the closest model point are mostly very similar. Take Figure 1 as an example the ADCP deployment estimated the depth to be 296 m, and the closest model point has 297 m depth. Depth data have only been ...
by BAN
Mon Aug 30, 2010 12:30 pm
Forum: ROMS Problems
Topic: Results and issues of barotropic tidal run
Replies: 14
Views: 5066

Re: Results and issues of barotropic tidal run

Hi John and arango, and thank you for your answers. Hopefully there is some misunderstanding... I believe that the model has been run for 40 days, and that I have excluded 10 of these as they most likely are contaminated by startup effects. This would leave the 30 days necessary in order to resolve ...
by BAN
Fri Aug 27, 2010 3:10 pm
Forum: ROMS Problems
Topic: Results and issues of barotropic tidal run
Replies: 14
Views: 5066

Re: Results and issues of barotropic tidal run

Thank you for the interest John. This particular ADCP deployment lasted just under a year, and the constituent information is supported by other deployments in the region (most are long time deployments). The data are from 150kHz RDI-ADCP and have undergone data quality procedures etc. The data have...
by BAN
Thu Aug 26, 2010 3:42 pm
Forum: ROMS Problems
Topic: Results and issues of barotropic tidal run
Replies: 14
Views: 5066

Results and issues of barotropic tidal run

Hi all I’m running ROMS in barotropic mode only forced by tides. The results are actually quite good for all validated constituents (surface and current) except for the current-ellipses of O1 in one area. In this area the modeled O1 current ellipses is up to five times too large (see Figure 1 below)...
by BAN
Wed Feb 24, 2010 12:35 pm
Forum: ROMS Discussion
Topic: Query related to Tidal simulation
Replies: 1
Views: 859

Re: Query related to Tidal simulation

Hi Maha I presently have one barotropic model setup running with only tidal forcing. The options I have used in the *.h file are given on the following page: https://www.myroms.org/forum/viewtopic.php?f=1&t=1717 under the topic "Some basic questions related to 2D current modeling in ROMS" The model ...
by BAN
Mon Feb 08, 2010 11:03 am
Forum: ROMS Usage
Topic: Some basic questions related to 2D current modeling in ROMS
Replies: 4
Views: 3175

Re: Some basic questions related to 2D current modeling in ROMS

- You are of cause right; f must be given in the grid file. - OK the model solves the equations using curvilinear coordinates, and there is no guarantee that a flat model space is solved significantly faster than any other curvilinear grid. For some reason I thought that the basic equations also wer...
by BAN
Fri Feb 05, 2010 12:54 pm
Forum: ROMS Usage
Topic: Some basic questions related to 2D current modeling in ROMS
Replies: 4
Views: 3175

Re: Some basic questions related to 2D current modeling in ROMS

Dear Kate, thank you very much for your reply. I think that I did not ask clearly enough in question 1. The situation is as follows: - I have a rotated Mercado-projection grid, although given in Lat Long coordinates, is almost identical to a regular spaced Cartesian grid. - We also have a 2D barotro...
by BAN
Thu Feb 04, 2010 3:21 pm
Forum: ROMS Usage
Topic: Some basic questions related to 2D current modeling in ROMS
Replies: 4
Views: 3175

Some basic questions related to 2D current modeling in ROMS

1: How to choose Cartesian grid over Spherical grid. - as far as I can see the Cartesian/Spherical option is made in the grid file, by setting variable spherical ='F'. Is this right? 2: In a new model application using only 2D physics and no tracers, the only model parameters that aught to be tuned...
by BAN
Thu Sep 03, 2009 2:47 pm
Forum: ROMS Usage
Topic: 2D tidal modelling and options in *.h and *.in files
Replies: 8
Views: 3560

Re: 2D tidal modelling and options in *.h and *.in files

I gave it a go once more. Using #define ANA_SMFLUX generates the surface stress with only zero values, so the 'GET_2DFLD - unable to find requested variable: sustr' -error is avoided. The time step also had to be adjusted so the model did not blow-up. . . and it runs quite fast :o) Thank you all for...
by BAN
Mon Aug 31, 2009 3:28 pm
Forum: ROMS Usage
Topic: 2D tidal modelling and options in *.h and *.in files
Replies: 8
Views: 3560

Re: 2D tidal modelling and options in *.h and *.in files

Hi again I gave it a go, but I quickly ran into new difficulties. If I use ‘# define BULK_FLUXES’ I have the errors mentioned above if running in 2D, and when I do not use ‘# define BULK_FLUXES’ I get the following error: GET_2DFLD - unable to find requested variable: sustr in file: file: ../in/frc_...
by BAN
Wed Aug 26, 2009 9:16 am
Forum: ROMS Usage
Topic: 2D tidal modelling and options in *.h and *.in files
Replies: 8
Views: 3560

Re: 2D tidal modelling and options in *.h and *.in files

Thank you very much for your suggestions. I’ll have a go at it.

p.s. Carlos if you have the time, it would be much appreciated if you did send me the *.h and *.in file. It is always good to have different examples. My email is given in the first post (gmail account usually is more stable).
by BAN
Tue Aug 25, 2009 4:14 pm
Forum: ROMS Usage
Topic: 2D tidal modelling and options in *.h and *.in files
Replies: 8
Views: 3560

Re: 2D tidal modelling and options in *.h and *.in files

Hi Kate. Thank you for the suggestion. I tried it (wrote "#undef SOLVE3D" in latte_c.h) but got compilation errors as given below. I think that the problem is that there are several 3D options turned on in latte_c.h which are violated by using "#undef SOLVE3D". I have been able to get it to compile ...
by BAN
Mon Aug 24, 2009 10:37 am
Forum: ROMS Usage
Topic: 2D tidal modelling and options in *.h and *.in files
Replies: 8
Views: 3560

2D tidal modelling and options in *.h and *.in files

Hi I am a new ROMS user and the first application is a high resolution Cartesian barotropic-tides-only run for the local region. We have a locally developed barotropic model, but we also want to run ROMS in 2D mode and do a comparison. ROMS is installed on the local cluster and some test cases have ...