Unstable LES simulation - Courant going higher throughout time - Flow around a sphere -- CFD Online Discussion Forums

October 31, 2016, 13:37	Unstable LES simulation - Courant going higher throughout time - Flow around a sphere	#1
beluiz93 New Member Bernardo Ribeiro Join Date: Aug 2016 Posts: 13 Rep Power: 9	Hi guys, So, I'm having a really big problem with my LES (Smagorinsky model) simulation. Basically, the Courant number is getting higher and higher and I saw in paraview that there is a point around the surface of my sphere that the velocity is exploding. This happens in the very beginning of my simulation. Does anyone know what might be happening? I'm using a relaxation Factor of 0.5 in all variables and my initial time step is around 10e-8 is order to try to get a more stable simulation.. I'm also using the pimpleFoam solver. Any help will be very appreciated! Thanks in advance!

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