# Flow over 4 airfoils in STAR-CCM+ -2D case

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October 17, 2018, 12:11
Flow over 4 airfoils in STAR-CCM+ -2D case
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JOHN SHERJY SYRIAC
Join Date: May 2018
Posts: 35
Rep Power: 5
Hi

I am trying to simulate flow over 4 airfoil one kept in the wake of another airfoil in 2D case. Rectangular domain is taken as the flow domain with K-omega model with polyhedral mesh.
Chord length c= 0.605m
Top and bottom surface = 5c -(symmetry plane)
inlet velocity =109 m/s
outlet = Pressure outlet
I am not able to get the predicted flow output. After some time, there is zero velocity zones in the domain. I have no clue why is it happening. It would be grateful if anyone could help me figure out the problem. I hereby attach the velocity scalar scene of the flow.
Thank you in advance
Attached Images
 4blades_LES_unsteady_2dcase_1_Scalar Scene 2.png (17.6 KB, 20 views)

 October 17, 2018, 13:42 #2 Senior Member   Matt Join Date: Aug 2014 Posts: 873 Rep Power: 15 How many iterations? What do your residuals look like? How are you initializing the solution? You need to provide more info.

 October 18, 2018, 23:09 #3 Member   JOHN SHERJY SYRIAC Join Date: May 2018 Posts: 35 Rep Power: 5 time step = 7.989*10^-5 the problem happens after around 0.5sec the residuals converge upto less than 10^-4

 Tags airfoil 2d, star-ccm+

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