<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">Dear Flash Users,<div><br></div><div>I am currently working on a setup in FLASH to study aspects of the CCSN problem. For now I’m using 1D spherical coordinates (eventually I’ll move to 3D) with the multipole gravity solver. I would ultimately like to do two things that I’m not sure are possible in FLASH:</div><div><br></div><div>1. Excise an inner region with radius less than some value, and simply compute the gravity from the excised mass as a point source. This would seem to involve both modifying the gravity solver to allow xmin > 0 (perhaps not possible with the multipole solver), and creating a hybrid between the poisson gravity solver and the point mass gravity implementation. My main interest will be in the outer regions of the star, so I don’t want my timestep to be limited by the inner regions.</div><div><br></div><div>2. Have a moving grid, so that the domain can expand over time. I haven’t seen any mention of this capability in FLASH, so I’m guessing it isn’t possible, but I thought I’d ask anyway.</div><div><br></div><div>If anyone has any advice on the best way to go forward with either of these goals (particularly 1.), I would appreciate it.</div><div><br></div><div>Thanks,</div><div>Cole Holcomb</div><div><br><div apple-content-edited="true">
<div style="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-text-size-adjust: auto; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div style="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-text-size-adjust: auto; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div style="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-text-size-adjust: auto; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div style="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-text-size-adjust: auto; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>--</div><div>Cole Holcomb<br><span style="font-size: 11px; ">PhD Student</span><br style="font-size: 11px; "><span style="font-size: 11px; ">Astrophysical Sciences, Princeton University</span><br><a href="mailto:cholcomb@astro.princeton.edu">cholcomb@astro.princeton.edu</a></div></div></div></div></div>
</div>
<br></div></body></html>