  This document describes the simulation framework used in the Snowmass Energy
Frontier studies for future Hadron Colliders. An overview of event generation
with {\sc Madgraph}5 along with parton shower and hadronization with {\sc
Pythia}6 is followed by a detailed description of pile-up and detector
simulation with {\sc Delphes}3. Details of event generation are included in a
companion paper cited within this paper. The input parametrization is chosen to
reflect the best object performance expected from the future ATLAS and CMS
experiments; this is referred to as the "Combined Snowmass Detector". We
perform simulations of $pp$ interactions at center-of-mass energies $\sqrt{s}=$
14, 33, and 100 TeV with 0, 50, and 140 additional $pp$ pile-up interactions.
The object performance with multi-TeV $pp$ collisions are studied for the first
time using large pile-up interactions.
