Thursday, June 23, 2016

FDS-SMV 6.5.0 Minor Release

This minor release is meant to address reports of numerical instabilities in tunnel fire cases with the recently released FDS 6.4.0, which may be attributed to relaxing the VN stability constraint from 0.5 to 1 in order to speed up calculations.

The key change implemented in FDS 6.5.0 is to include the baroclinic term in the pressure iteration scheme.  This corrects a time lag between the hyrdodynamic pressure in the baroclinic term and the output from the pressure Poisson equation.

Other improvements implemented in this version include an optional iteration in the radiation solve for multi-mesh simulations and more accurate interpolation of particle force terms.  More information is given in the Release Notes.

Here is a link to our Downloads page.


Tuesday, April 12, 2016

FDS-SMV 6.4.0 Minor Release

A new minor release, FDS-SMV 6.4.0, has been posted.  This release fixes a couple of issues with the combustion model.  The first was a bug in the reaction divergence expression that led to below ambient temperatures in some instances.  The second was a problem with boundedness for multiple reactions, mainly affecting complex chemistry.

https://pages.nist.gov/fds-smv/downloads.html

In this release we have also fixed several issues with MPI scaling.  With a time grant on the Oak Ridge National Lab supercomputer, Titan, we were able to run FDS on up to roughly 10,000 processes.  Linear scaling was achieved to roughly 16^3 mesh size (4096 cells/mesh).


















For further details on this release see the FDS Release Notes.



Monday, December 7, 2015

FDS-SMV 6.3.2 Maintenance Release

A maintenance release, v6.3.2, has been posted to correct a bug in the liquid evaporation routines.  The bug should only affect v6.3.1.

FDS-SMV Downloads

Thursday, November 12, 2015

Uploading text files for Issues on GitHub

I recently got notification from GitHub support that they now allow Write access for uploading text files to Issues posts.  This is welcome news.

Thanks to Dave McGill for testing this new feature.

This means that when you post an Issue you can attach your input file.  But remember you need to append ".txt" to the file name.  For example, if your input file is simple_test.fds, you need to change the name to simple_test.fds.txt or just simple_test.txt.

Tuesday, November 10, 2015

FDS 6.3.1 Maintenance Release

Today we posted a maintenance release, FDS 6.3.1, bundled with Smokeview 6.3.2.

The main motivation for pushing out this release is to correct a bug in the mixing step for multi-step and finite-rate chemistry calculations.  The default simple chemistry model is not affected.

An optional input parameter DT_HVAC has been added to help stabilize duct flow calculations.

Additionally, we have been working on testing FDS scaling on large compute clusters, like Titan at Oak Ridge National Laboratories.  The results for weak and strong scaling on our burn cluster at NIST are published in the new user's guide and we have added an option to suppress output diagnostics, which slow the code for large jobs.

FDS-SMV website

FDS-SMV download page

Installation Instructions

FDS Release Notes

Smokeview Release Notes