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We present a validation of the Dark Energy Survey Year 3 (DES Y3)$3\times2$-point analysis choices by testing them on Buzzard v2.0, a new suiteof cosmological simulations that is tailored for the testing and validation ofcombined galaxy clustering and weak lensing analyses. We show that the Buzzardv2.0 simulations accurately reproduce many important aspects of the DES Y3data, including photometric redshift and magnitude distributions, and therelevant set of two-point clustering and weak lensing statistics. We then showthat our model for the $3\times2$-point data vector is accurate enough torecover the true cosmology in simulated surveys assuming the true redshiftdistributions for our source and lens samples, demonstrating robustness touncertainties in the modeling of the non-linear matter power spectrum,non-linear galaxy bias and higher-order lensing corrections. Additionally, wedemonstrate for the first time that our photometric redshift calibrationmethodology, including information from photometry, spectroscopy, clusteringcross-correlations, and galaxy-galaxy lensing ratios, is accurate enough torecover the true cosmology in simulated surveys in the presence of realisticphotometric redshift uncertainties.

Dark Energy Survey Year 3 results: cosmology from combined galaxy clustering and lensing -- validation on cosmological simulations