Switching from linear to second order methods -- CFD Online Discussion Forums

September 16, 2021, 17:03	Switching from linear to second order methods	#1
Adithya_11 Member Adithya Join Date: May 2021 Posts: 73 Rep Power: 4	Hello I have been simulating an aircraft using the SA turbulence model. Mesh quality is good. Steady state. I have been having divergence problems when I run it with these settings: Coupled with time factor 0.1, green gauss node based, second order discretization. So, I decided to run a first order analysis and then use that to initialize my second order case. The first order uses SIMPLE and first order for all discretization parameters. I decreased certain under relaxation parameters. This offers stability and even converges. When do I switch from the first order to the second order? Is there a recommended value that the residuals need to drop below for me to make the switch or should i switch after it converges?

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