Convergence problem

nasir.iitd · April 29, 2016, 02:47

Hello everybody,
I'm simulating a pipe flow with a v-cone flow meter co-axially placed in it. I 'm using RNG k-epsilon and STD k-omega model in Ansys 15.0 fluent. If the flow velocity is below 1 m/s the solution converges easily within 2000 iterations but if the flow velocity is set to 2 m/s, 3 m/s or 4 m/s the solution does not converge even upto 50,000 iterations. The residuals are set to 1e-06.The under-relaxation factors are set to default setting for 1 m/s fluid velocity, there after I reduced it for higher velocities, results did not show any improvement. Need help to get a converged solution.

vasava · May 2, 2016, 05:20

How is the mesh? Post some pictures of mesh, information about mesh quality and picture of the convergence graph.

April 29, 2016, 02:47	Convergence problem	#1
nasir.iitd Member SHEIKH NASIRUDDIN Join Date: Aug 2013 Location: DELHI Posts: 52 Rep Power: 12	Hello everybody, I'm simulating a pipe flow with a v-cone flow meter co-axially placed in it. I 'm using RNG k-epsilon and STD k-omega model in Ansys 15.0 fluent. If the flow velocity is below 1 m/s the solution converges easily within 2000 iterations but if the flow velocity is set to 2 m/s, 3 m/s or 4 m/s the solution does not converge even upto 50,000 iterations. The residuals are set to 1e-06.The under-relaxation factors are set to default setting for 1 m/s fluid velocity, there after I reduced it for higher velocities, results did not show any improvement. Need help to get a converged solution.

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May 2, 2016, 05:20		#2
vasava Senior Member Paritosh Vasava Join Date: Oct 2012 Location: Lappeenranta, Finland Posts: 732 Rep Power: 22	How is the mesh? Post some pictures of mesh, information about mesh quality and picture of the convergence graph.