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First Order vs. Second Order

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Old   December 29, 2016, 15:20
Default First Order vs. Second Order
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engeagle
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Hello,

I study on some analyses for my thesis. When I used first order, they were converged. But when I used second order, I have convergence problem. I tried different ways, I decreased under relaxation factors, Firstly, I used first order and then I continued with second order. But I couldn't solve this problem. I want to ask that are first order solutions acceptable? My mesh is tetrahedral. The flow is laminar.

Also, I study on a combustion simulation. I have convergence problem. How can I solve this problem?
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