Interaction of a giant planet in an inclined orbit with a circum-stellar disk (2009)
Marzari, F., Nelson, Andrew F.
We investigate the dynamical evolution of a Jovian--mass planet injected into an orbit highly inclined with respect to its nesting gaseous disk. Planet--planet scattering induced by convergent...
Wetzstein, M., Nelson, Andrew F., Naab, T., Burkert, A.
We present a Fortran 95 code for simulating the evolution of astrophysical systems using particles to represent the underlying fluid flow. The code is designed to be versatile, flexible and...
Nelson, Andrew F., Wetzstein, M., Naab, T.
We continue our presentation of VINE. We begin with a description of relevant architectural properties of the serial and shared memory parallel computers on which VINE is intended to run, and...
Gravitational instability in binary protoplanetary disks (2007)
Mayer, Lucio, Boss, Alan, Nelson, Andrew F.
We review the models and results of simulations of self-gravitating, gaseous protoplanetary disks in binary star systems. These models have been calculated by three different groups with three...
Numerical requirements for simulations of self gravitating and non-self gravitating disks (2006)
(highly abridged) We define three requirements for accurate simulations that attempt to model circumstellar disks and the formation of collapsed objects (e.g. planets) within them. First, we define a...
A proposed origin for chondrule-forming shocks in the solar nebula (2005)
Nelson, Andrew F., Ruffert, Maximilian
We propose that the nebular shocks currently favored as a model to form chondrules and other annealed silicates in the solar nebula originate in the dynamical activity present in the envelope of...
A Resolution Requirement for Disk Simulations Modeling Collapse (2003)
The accurate simulation of collapsed objects requires that a huge range of spatial scales be well resolved if the result is not to be contaminated by numerically induced fragmentation. In this...
Nelson, Andrew F., Benz, Willy
(abridged) We analyze the formation and migration of a proto-Jovian companion in a circumstellar disk in 2d, during the period in which the companion makes its transition from `Type I' to `Type II'...
Nelson, Andrew F., Benz, Willy
(abridged) We find that a disk can supply a forming planet with mass at an essentially infinite rate ($\sim1$\mj/25 yr) so that a gap could form very quickly. We show that mass accretion rates faster...
Planet formation is unlikely in equal mass binary systems with a ~ 50 AU (2000)
We show that planet formation via both gravitational collapse and core accretion is unlikely to occur in equal mass binary systems with moderate (~ 50 AU) semi-major axes. Internal thermal energy...
Dynamics and Observational Appearance of Circumstellar Disks (1999)
In my thesis I present a study of the dynamics and observational characteristics of massive circumstellar disks in two dimensions ($r$, $\phi$) using two complimentary hydrodynamic codes: a `Smoothed...
Dynamics of Circumstellar Disks II: Heating and Cooling (1999)
Nelson, Andrew F., Benz, Willy, Ruzmaikina, Tamara
We present a series of 2-d ($r,\phi$) hydrodynamic simulations of marginally self gravitating disks around protostars using an SPH code. We implement simple dynamical heating and we cool each...
Towards Understanding Jovian Planet Migration (1999)
Nelson, Andrew F., Benz, Willy
We present 2D hydrodynamic simulations of circumstellar disks around protostars using a `Piecewise Parabolic Method' (PPM) code. We include a point mass embedded within the disk and follow the...
Dynamics of Circumstellar Disks (1998)
Nelson, Andrew F., Benz, Willy, Adams, Fred C., Arnett, David
We present a series of 2-dimensional hydrodynamic simulations of massive disks around protostars. We simulate the same physical problem using both a `Piecewise Parabolic Method' (PPM) code and a...
Optimizing Practice Through Research: A New Perspective to Solve an Old Problem
Kottke, Thomas E., Solberg, Leif I., Nelson, Andrew F., Belcher, Donald W., Caplan, William, Green, Lawrence W., ...
Policy makers, researchers, clinicians, and the public are frustrated that research in the health sciences has not resulted in a greater improvement in patient outcomes. Our experience as clinicians...
Greenlee, Robert T., Coleman, Laura A., Nelson, Andrew F., Selby, Joseph V.
The Health Maintenance Organization Research Network held its annual meeting in Minneapolis in April of 2008, with more than 300 investigators, research staff, clinical leaders, and academic partners...
Partnering Care Delivery and Research to Optimize Health
Coleman, Laura A., Kottke, Thomas E., Rank, Brian, Reding, Douglas J., Selna, Mark, Isham, George J., ...
A close partnership between care delivery and research organizations has the potential to provide essential elements needed to optimize health and health care. This clinical leadership panel, held...