Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: ResFrac Technical Writeup   ResFrac is a combined hydraulic fracturing, reservoir, and hydraulic
fracturing simulator. It describes multiphase fluid flow (black oil or
compositional), proppant transport, transport of non-Newtonian fluid additives,
and thermal transport. It also includes stress shadowing from fracture
propagation and porothermoelastic responses from pressure change in the matrix.
It uses constitutive equations that smoothly transition between equations for
flow through an open crack to flow through a closed crack (with or without
proppant). This document provides a detailed technical description of the code,
along with validation simulations to confirm numerical accuracy.

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The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org