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how can i fix reverse flow? jet impigment 3d modelling

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Old   April 28, 2021, 17:13
Smile how can i fix reverse flow? jet impigment 3d modelling
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Mauro Killary
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In context i'm simulating a 3d inclined plane, jet impigement, i decided to use this approach due to in next steps of my work i need to evaluate particle trajectories (DPM analysis, erosion analysis), the problem is transient so decided to take care with the courant number so i use a size of time step of 3e-6 and 1.5 e-6, i know the depency of the mesh with the courant number and the velocity (17 m/s in this case) so i try to put a "bed" to avoid the effect of the reverse flow at the outlet, also i use a good size in the wall to evaluate the boundary layer Y+ (i used a typical equations based on the Reynolds numer), i used pressure outlet or outflow boundary but in the two cases "reverse flow" appear (also the relation H/D is too short, 1 in this case) i hope a core of the jet not a developed region, the cuestion here is in what is the ralation in my result if i keep this reverse flow, the issue too is that the convegence is still remain (i used a 1e-6 value for residuals).

Is true mantain this approach because anyways a reach a convergence (only residuals, not constant pressure at the wall)

Additionally i use a report plot to monotoring the pressure in the wall impingement but this mantain a occilatory behavior until around 0.004 seconds.

I let you two screen of the mesh and the fluent GUI [IMG][/IMG]
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courant number, jet impingment, reversed flow, transient 3d

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