Dear FLASH Users,<div><br></div><div>I noticed that the option to excise a hole from the grid with the split solver appears to have been removed between FLASH4-beta and FLASH4. (this used to be done with useHole = .true.). </div>
<div><br></div><div>Can anyone comment on the reason for removing this option? </div><div><br></div><div>Thank you,</div><div><br>Morgan</div><div><br><div class="gmail_quote">On Fri, Sep 14, 2012 at 3:28 PM, Klaus Weide <span dir="ltr"><<a href="mailto:klaus@flash.uchicago.edu" target="_blank">klaus@flash.uchicago.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">The Flash Center is pleased to announce the release of the new version of<br>
the FLASH code, version 4.0. FLASH4 closely follows the architecture of<br>
FLASH3. The most important changes from FLASH3 are several new<br>
capabilities in both physics solvers and infrastructure. A major part of<br>
the new physics capabilities were introduced to support simulations of<br>
high-energy-density physics (HEDP). FLASH4 also includes four significant<br>
capabilities contributed by our external users.<br>
<br>
<br>
The major new capabilities in FLASH4 that were not included in FLASH3<br>
are (marked with ** are the external contributions, please see the<br>
User's Guide for references and appropriate credits):<br>
<br>
* 3T capabilities in the split and unsplit Hydro solvers.<br>
There is support for non-Cartesian geometry, and<br>
the unsplit solver also supports stationary rigid bodies.<br>
<br>
* Upwind biased constrained transport (CT) scheme in the unsplit<br>
staggered mesh MHD solver.<br>
<br>
* Full corner transport upwind (CTU) algorithm in the unsplit<br>
hydro/MHD solver.<br>
<br>
* Cylindrical geometry support in the unsplit<br>
staggered mesh MHD solver on UG and AMR. A couple of MHD<br>
simulation setups using cylindrical geometry.<br>
<br>
* Radiation diffusion.<br>
<br>
* Conduction.<br>
<br>
* Heat exchange.<br>
<br>
* Multi-Temperature Multi-Material Multi-Table Eos.<br>
<br>
* Opacities, ability to use hot and cold opacities.<br>
<br>
* EnergyDeposition unit with laser ray tracing, with threading<br>
for performance.<br>
<br>
* A new multipole solver.<br>
<br>
* Ability to replicate mesh for multigroup diffusion or other<br>
similar applications.<br>
<br>
* OpenMP threading of several important solvers at both<br>
coarse-grain (one block per thread) and fine-grain<br>
(threads within a block) levels.<br>
<br>
* Ability to add particles during evolution.<br>
<br>
* Limited support for Chombo as an alternative AMR mesh package.<br>
<br>
* Several new HEDP simulation setups.<br>
<br>
* Hybrid PIC. **<br>
<br>
* Barnes-Hut-Tree based gravity solver. **<br>
<br>
* Primordial chemistry. **<br>
<br>
* Sink particles. **<br>
<br>
<br>
The release also includes several new features and resolves a number<br>
of bugs found in previous releases up to 4-beta.<br>
<br>
<br>
Please see the attachment for a more detailed summary,<br>
and for download instructions.<br>
<br>
<br>
Development of the FLASH Code was funded by the DOE-supported<br>
ASC/Alliance Center for Astrophysical Thermonuclear Flashes,<br>
and continues to be funded by DOE NNSA and NSF.<br>
We acknowledge support received from Lawrence Livermore National<br>
Laboratory and the University of Chicago.<br>
<br>
All publications resulting from the use of the FLASH Code must<br>
acknowledge the Flash Center for Computational Science.<br>
Addition of the following text to the paper acknowledgments<br>
will be sufficient.<br>
<br>
"The software used in this work was in part developed by the<br>
DOE- and NSF-supported Flash Center for Computational Science<br>
at the University of Chicago."</blockquote></div><br></div>