Adaptive Ray Tracing for Radiative Transfer around Point Sources
نویسندگان
چکیده
We describe a novel adaptive ray tracing scheme to solve the equation of radiative transfer around point sources in hydrodynamical simulations. The angular resolution adapts to the local hydrodynamical resolution and hence is of use for adaptive meshes as well as adaptive smooth particle hydrodynamical simulations. Recursive creation of rays ensures ease of implementation. The multiple radial integrations needed to solve the time dependent radiative transfer are sped up significantly using a quad–tree once the rays are cast. Simplifications advantageous for methods with one radiation source are briefly discussed. The suggested method is easily generalized to speed up Monte Carlo radiative transfer techniques. In summary a nearly optimal use of long characteristics is presented and aspects of its implementation and comparison to other methods are given.
منابع مشابه
Hybrid Characteristics: 3D radiative transfer for parallel adaptive mesh refinement hydrodynamics
We have developed a three-dimensional radiative transfer method designed specifically for use with parallel adaptive mesh refinement hydrodynamics codes. This new algorithm, which we call hybrid characteristics, introduces a novel form of ray tracing that can neither be classified as long, nor as short characteristics, but which applies the underlying principles, i.e. efficient execution throug...
متن کاملA Scalable Algorithm for Radiative Heat Transfer Using Reverse Monte Carlo Ray Tracing
Radiative heat transfer is an important mechanism in a class of challenging engineering and research problems. A direct all-to-all treatment of these problems is prohibitively expensive on large core counts due to pervasive allto-all MPI communication. The massive heat transfer problem arising from the next generation of clean coal boilers being modeled by the Uintah framework has radiation as ...
متن کاملC-Ray: A new method for photon-conserving transport of ionizing radiation
We present a new numerical method for calculating the transfer of ionizing radiation, called C2-Ray (Conservative, Causal Ray-tracing method). The transfer of ionizing radiation in diffuse gas presents a special challenge to most numerical methods which involve timeand spatial-differencing. Standard approaches to radiative transport require that grid cells must be small enough to be optically-t...
متن کاملRay-tracing for complex astrophysical high-opacity structures
We present a ray-tracing technique for radiative transfer modeling of complex three-dimensional (3D) structures which include dense regions of high optical depth like in dense molecular clouds, circumstellar disks, envelopes of evolved stars, and dust tori around active galactic nuclei. The corresponding continuum radiative transfer problem is described and the numerical requirements for invers...
متن کاملDiscrete vs. continuum-scale simulation of radiative transfer in semitransparent two-phase media
The mathematical formulation of the continuum approach to radiative transfer modeling in two-phase semi-transparent media is numerically validated by comparing radiative fluxes computed by (i) direct, discrete-scale and (ii) continuum-scale approaches. The analysis is based on geometrical optics. The discrete-scale approach uses the Monte Carlo ray-tracing applied directly to real 3D geometry m...
متن کامل