0 Assigned ID: 5273 ----- Attempting Submission 1 (Mon Mar 25 23:37:30 GMT 2024) ----- Multi-phase gas and turbulence are ubiquitous in astrophysics. In recent years, there has been remarkable progress in understanding how hot and cold gas phases exchange mass, momentum and energy at phase boundaries, or turbulent mixing layers (TMLs). This can enable the survival, growth and entrainment of cold clouds in galactic winds or turbulent gas, as well as provide a drag force for HVCs which exceeds standard hydrodynamic drag. Unfortunately, observational tests have been hampered by the fact that most hydrodynamic simulations do not resolve TMLs, or implement thermal conduction, which is crucial to predicting line ratios. We develop a new tool, Interface, which post-processes low resolution simulations (even without conduction) to generate predictions of TML absorption, emission and ion column densities in a matter of minutes or seconds. It leverages the success of semi-analytic models which match high-resolution TML simulations with conduction. TMLs can potentially explain the presence of high ions such as OVI (which peak at thermally unstable T ~ 10^5 K temperatures), the kinematic alignment of low and high ions, and tight correlation of soft X-ray and H-alpha surface brightness in various settings. The accuracy and low computational cost of our tool will enable more efficient and realistic comparisons of current low resolution simulations with observations of HVCs, ram-pressure stripped galaxies, and CGM absorption line measurements, amongst myriad applications. We will test Interface against high resolution hydrodynamic simulations where all relevant lengthscales are resolved, and release an open source Python module for all to use. PI Oh, Co-I Fielding and Co-I Tan are all experts in the theory of the CGM, hydrodynamics, MHD and radiative cooling. They have collectively written many of the key papers relevant to this proposal. They will guide the graduate student in this work. Graduate student Chen is doing his PhD on CGM theory. He has already written two substantial papers on turbulent mixing layers and cold cloud entrainment. He will be supported by this proposal and carry out the work. Intergalactic Medium and the Circumgalactic Medium Galaxies 0 false false false false true false false SUPPORTED