<html><head><meta http-equiv="Content-Type" content="text/html charset=iso-8859-1"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi Phil,<div><br></div><div>FLASH4 has implemented support for 1.5D spherical and 2.5D cylindrical in the <i>unsplit</i> family of solvers. Angular momentum should indeed be conserved. Again, this is only implemented for the unsplit solvers so make sure to use +uhd or +usm in your setup line.</div><div><br></div><div>Cheers,</div><div>Sean</div><div><br><div apple-content-edited="true"><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px; "><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><br class="Apple-interchange-newline">--------------------------------------------------------</div><div>Sean M. Couch, Ph.D.</div><div>Hubble Fellow</div><div>Flash Center for Computational Science</div><div>Department of Astronomy & Astrophysics</div><div>The University of Chicago</div><div>5747 S Ellis Ave, Jo 315</div><div>Chicago, IL 60637</div><div>(773) 702-3899</div><div><a href="http://www.flash.uchicago.edu/~smc">www.flash.uchicago.edu/~smc</a></div><div><br></div><div><br></div></div></span></span></div></div><div><div>On Sep 20, 2012, at 1:18 PM, Philip Chang <<a href="mailto:chang65@uwm.edu">chang65@uwm.edu</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">Hello,<br><br>I have previously used FLASH 3.1 and 3.2, but these versions didn't have 2.5 d properly implemented. In particular, the v_phi component in a r-z (cylindrical) geometry didn't conserve angular momentum as it was being advected (along the r direction). Has this been resolved in flash 4? I wouldn't have thought so, but a quick glance at the flash 4 documentation reveals that the magnetic accretion torus test problem (which demands angular momentum conservation) to get the MRI or so I would think.<br><br>So has FLASH 4 implemented conservation of angular momentum for the v_phi component in cylindrical geometry? Or does it do it only for a limited number of solvers?<br><br>Thanks,<br>Phil<br><br></blockquote></div><br></body></html>