turbulent pulsed jet flows

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  • Last Post 08 March 2019
yehiaismail posted this 06 March 2019

I am modelling turbulent pulsed jet flows and I ma running unsteady case but I am facing difficulty with the convergence of residuals of continuity although I set it to 10^-3 and I tried decreasing under relaxation factors

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kkanade posted this 07 March 2019

can you please insert some zoomed in images of your mesh. also give more information about your set up

yehiaismail posted this 07 March 2019

yehiaismail posted this 07 March 2019

I have very small inlet where I refined the mesh very much at that region and my boundary condition the velocity inlet is time dependent 

 

rwoolhou posted this 08 March 2019

If the pulsed jet is firing into those high aspect ratio cells I can see why it's struggling. You need to reduce the aspect ratio to 4-5 where flow is not aligned to (or is changing along the length of) cells. 

yehiaismail posted this 08 March 2019

So how could I reduce the aspect ratio?should I try to refine the area near the inlet more?

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