The stress-pressure relationship in simulations of MRI-induced turbulence
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Abstract
We determine how MRI-turbulent stresses depend on gas pressure via a suite of
unstratified shearing box simulations. Earlier numerical work reported only a
very weak dependence at best, results that call into question the canonical
alpha-disk model and the thermal stability results that follow from it. Our
simulations, in contrast, exhibit a stronger relationship, and show that
previous work was box-size limited: turbulent `eddies' were artificially
restricted by the numerical domain rather than by the scale height.
Zero-net-flux runs without physical diffusion coefficients yield a stress
proportional to
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1365-2966
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Science and Technology Facilities Council (ST/K501906/1)