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Recent efforts to include kinetic effects in fluid simulations of plasmashave been very promising. Concerning collisionless magnetic reconnection, ithas been found before that damping of the pressure tensor to isotropy leads togood agreement with kinetic runs in certain scenarios. An accuraterepresentation of kinetic effects in reconnection was achieved in a study byWang et al. (Phys. Plasmas, volume 22, 2015, 012108) with a closure derivedfrom earlier work by Hammett and Perkins (PRL, volume 64, 1990, 3019). Here,their approach is analyzed on the basis of heat flux data from a Vlasovsimulation. As a result, we propose a new local closure in which heat flux isdriven by temperature gradients. That way, a more realistic approximation ofLandau damping in the collisionless regime is achieved. Previous issues areaddressed and the agreement with kinetic simulations in different reconnectionsetups is improved significantly. To the authors' knowledge, the new fluidmodel is the first to perform well in simulations of the coalescence of largemagnetic islands.

Temperature gradient driven heat flux closure in fluid simulations of collisionless reconnection