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I'm simulating a turbine.

The convergence of solution is monitored by checking the residuals of the numerically solved governing equations. The "viscous-spalarat-almaras" model is used, and used air with constant density. Pressure-velocity coupled scheme and pressure based solver are selected.

According to the following figures, torque is increasing but the residual of continuity does not decrease and is almost constant. T

Image 1

Image 2
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Image 3
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Is there any problem?

According to monitored torque, the solution is not converged.

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  • $\begingroup$ If you're sure your simulation really has a steady state solution, then you might want to play with relaxation parameters or check your grid quality. $\endgroup$ – Carlton Sep 13 '15 at 3:21
  • $\begingroup$ Hi, Thanks your answer, There is many papers that is used steady state. How to play? Do I decrease URF(under-relaxation factors)? Momentum and pressure URF are 0.2 in this run, respectively. How to check mesh? I am performing different mesh and also, I am using adaption option in fluent. Do you have another suggestions? I am grateful that guide me about this cases. $\endgroup$ – user19061 Sep 13 '15 at 6:05
  • $\begingroup$ Now I understand that second figure is not torque but it is total torque coefficient. How do I monitor the torque? $\endgroup$ – user19061 Sep 13 '15 at 6:25
  • $\begingroup$ What kind of turbine? the constant air density assumption might be incorrect. $\endgroup$ – Algo Sep 15 '15 at 15:56
  • $\begingroup$ air turbine, namely, wells turbine $\endgroup$ – user19061 Sep 17 '15 at 20:55

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