<div dir="ltr">Thank you Ian Hinder.<div><br></div><div>Yes I want to add a low density fluid to a BBH simulation.</div><div><br></div><div>I review the source code of GRHydro_InitialData Thorn's GRHydro_OnlyAtmo.F90 . I found it give any position ( I mean every nx,ny,nz) a rho value which is a constant equal to "rho_abs_min" or "initial_rho_abs_min".</div><div><br></div><div>so I think it can give a low density fluid to a BBH simulation.</div><div><br></div><div>But it report "NAN" or "Con2Prim: count > GRHydro_countmax".</div><div><br></div><div>Thank again.</div><div><br></div><div>Yours</div><div>Zhi-Chao.</div></div><div class="gmail_extra"><br><div class="gmail_quote">2017-08-18 21:54 GMT+08:00 Ian Hinder <span dir="ltr"><<a href="mailto:ian.hinder@aei.mpg.de" target="_blank">ian.hinder@aei.mpg.de</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word"><br><div><span class=""><div>On 17 Aug 2017, at 09:57, 赵志超 <<a href="mailto:yanyuechuixue@gmail.com" target="_blank">yanyuechuixue@gmail.com</a>> wrote:</div><br class="m_-6116555910627652009Apple-interchange-newline"><blockquote type="cite"><div dir="ltr"><div>Hello everyone, </div><div><br></div><div>I am studying how to use Einstein_toolkit, I want to try to add atmosphere to a BBH evolution.</div><div>I add the below things to BBHLowRes.par in the par dir.</div><div>However, it reports "nan" error soon after the beginning of evolution.</div><div>I do not know how to correct it. </div><div>Could anyone give me some suggestion?</div></div></blockquote><div><br></div></span><div>Hi,</div><div><br></div><div>Could you give more details about the physics you are trying to add? "atmosphere" in this context usually means an artificial low density fluid in a matter simulation which helps with numerical problems that occur when the density drops to zero. It doesn't make sense to add it to a BBH simulation, which is vacuum.</div><div><br></div><div>Do you mean that you want to add a low density fluid to a BBH simulation?</div><span class="HOEnZb"><font color="#888888"><div><br></div></font></span></div><span class="HOEnZb"><font color="#888888"><div>
<div style="color:rgb(0,0,0);letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;word-wrap:break-word"><div style="color:rgb(0,0,0);letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;word-wrap:break-word"><div style="color:rgb(0,0,0);letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;word-wrap:break-word"><div style="color:rgb(0,0,0);letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;word-wrap:break-word"><div>-- </div><div>Ian Hinder</div><div><a href="http://members.aei.mpg.de/ianhin" target="_blank">http://members.aei.mpg.de/<wbr>ianhin</a></div></div></div></div></div>
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<br></font></span></div></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div>赵志超</div><div>中国科学院高能物理研究所</div><div>中国 北京</div><div>18401696963</div><div><a href="mailto:yanyuechuixue@gmail.com" target="_blank">yanyuechuixue@gmail.com</a></div></div></div>
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