<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi Hee Il,<div><span class="Apple-tab-span" style="white-space:pre"> </span></div><div><div><div>On Oct 17, 2011, at 11:10 PM, Hee Il Kim wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>I'm doing the BNS test with magnetic fields but it's just in the<br>beginning stage. I don't know whether other people or the MHD<br>developers have done the test for the BNS. The BNS simulations with<br>the ET requires somewhat different setup from Whisky+BSSN_MoL. </div></blockquote><div><br></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>I imagine you are using McLachlan for the Einstein equations, but what are the other differences? I presume you are also using PPM+HLLE. There is a difference between C2P in GRHydro and Whisky, but the rest should be similar I presume.</div><br><blockquote type="cite"><div>I'm<br>using a private thorn of Frank for the AMR. For the initial data, I<br>modified the public bns reader, Meudon_Bin_NS.<br></div></blockquote><div><br></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>OK. If I were to do a comparison with Whisky I would use my thorns for ID and AMR.</div><br><blockquote type="cite"><div>Currently, I have little information on the best parameter setup for<br>the MHD. Please let me know if there's any special treatment required<br>for the MHD. Also I'd like to hear from Bruno on the initial B-field<br>data. Do I need anything more than I can expect from the initial<br>vector potential you used in the literatures?<br></div></blockquote><div><br></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>the vector potential I used in my simulations is exactly the one that is mentioned in my papers (Giacomazzo et al 2009 and Giacomazzo et al 2011). Other people have used slightly different versions (Anderson et al 2008, Liu et al 2008). The vector potential I used for the initial data has the property of having also the first derivative of the magnetic field (B) going to zero when B goes to zero (i.e., it is more smooth than the one used in the other papers).</div><div><br></div><div>Cheers,</div><div>Bruno</div><br><blockquote type="cite"><div>Thanks in advance,<br><br>Hee Il<br><br>2011/10/18 Bruno Giacomazzo <<a href="mailto:bruno.giacomazzo@jila.colorado.edu">bruno.giacomazzo@jila.colorado.edu</a>>:<br><blockquote type="cite">Hi,<br></blockquote><blockquote type="cite">I have some questions about the MHD version of GRHydro. Today I had a<br></blockquote><blockquote type="cite">business meeting at the time of the telecon, otherwise I'd have asked them<br></blockquote><blockquote type="cite">during the telecon.<br></blockquote><blockquote type="cite">It is my understanding that the next release of the ET will happen next week<br></blockquote><blockquote type="cite">and it will contain MHD. Did you do already some tests in GR? Did you try<br></blockquote><blockquote type="cite">the evolution of BNS with magnetic fields? I'd like to try to run the code<br></blockquote><blockquote type="cite">with magnetized BNS and see how it compares with Whisky. As some of you know<br></blockquote><blockquote type="cite">in the past I had problems with divergence cleaning (DC) when evolving BNS<br></blockquote><blockquote type="cite">(strong violations of divB after the merger when the BH and the torus are<br></blockquote><blockquote type="cite">formed when using AMR) and so I'm curious to see if the implementation of DC<br></blockquote><blockquote type="cite">in GRHydro is more robust than the one I have in Whisky.<br></blockquote><blockquote type="cite">Thanks,<br></blockquote><blockquote type="cite">Bruno<br></blockquote><blockquote type="cite">P.S.: I will try to join the next ET telecon, so that I can get an update<br></blockquote><blockquote type="cite">before coming to LSU.<br></blockquote><blockquote type="cite">Dr. Bruno Giacomazzo<br></blockquote><blockquote type="cite">JILA - University of Colorado<br></blockquote><blockquote type="cite">440 UCB<br></blockquote><blockquote type="cite">Boulder, CO 80309<br></blockquote><blockquote type="cite">USA<br></blockquote><blockquote type="cite">Tel. : +1 303-492-0389<br></blockquote><blockquote type="cite">Fax : +1 303-492-5235<br></blockquote><blockquote type="cite">email : <a href="mailto:bruno.giacomazzo@jila.colorado.edu">bruno.giacomazzo@jila.colorado.edu</a><br></blockquote><blockquote type="cite">web: <a href="http://www.brunogiacomazzo.org">http://www.brunogiacomazzo.org</a><br></blockquote><blockquote type="cite">----------------------------------------------------------------------<br></blockquote><blockquote type="cite">There are only 10 types of people in the world:<br></blockquote><blockquote type="cite">Those who understand binary, and those who don't<br></blockquote><blockquote type="cite">----------------------------------------------------------------------<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">_______________________________________________<br></blockquote><blockquote type="cite">Users mailing list<br></blockquote><blockquote type="cite"><a href="mailto:Users@einsteintoolkit.org">Users@einsteintoolkit.org</a><br></blockquote><blockquote type="cite"><a href="http://lists.einsteintoolkit.org/mailman/listinfo/users">http://lists.einsteintoolkit.org/mailman/listinfo/users</a><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><br></blockquote></div></blockquote></div><br><div apple-content-edited="true">
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; 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line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div><div>Dr. Bruno Giacomazzo</div><div>JILA - University of Colorado</div><div>440 UCB<br>Boulder, CO 80309</div><div>USA</div><div><br></div><div>Tel. : +1 303-492-0389</div><div><div>Fax : +1 303-492-5235</div></div><div>email : <a href="mailto:bruno.giacomazzo@jila.colorado.edu">bruno.giacomazzo@jila.colorado.edu</a></div><div>web: <a href="http://www.brunogiacomazzo.org">http://www.brunogiacomazzo.org</a></div><div><br></div><div>----------------------------------------------------------------------</div><div>There are only 10 types of people in the world:</div><div>Those who understand binary, and those who don't</div><div>----------------------------------------------------------------------</div></div></span></span></span></div></span></div></span></div></span></div></span></span>
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