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JWST_Simulation generates a novel geometric-focused deep field simulation of the expected JWST future deep field image. Galaxies are represented by ellipses with randomly-generated positions and orientations. Three scripts are included: a deterministic simulation, an ensemble simulation, and a more-realistic monochrome image simulation. The following initial conditions can be perturbed in these codes: H0, Ωm, ΩΛ, the dark energy equation of state parameter, the number of unseen galaxies in the Hubble Ultra Deep Field Image (HUDF), the increase in effective radius due to the JWST’s higher sensitivity, the anisotropy of dark energy, and the maximum redshift reached by the JWST. Galaxy number densities are estimated using integration over comoving volume with an integration constant calibrated with the Hubble Ultra Deep Field. A galaxy coverage percentage is calculated for each image to determine the percentage of the background occupied by galaxies.