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Hello everybody, Is anyone well informed about SPH Inlets/Outlets Conditions? I´m a beginner and have little knowledge, here is my situation: I´m making a simulation of a pipe. The fluid is air. The SPH that are defined at the Inlet should flow through the pipe and be eliminated at the Outlet. First problem is that only a part of the SPH are eliminated at the Outlet. Second problem is that my calculation time is very long even for simple simulations. Some data on the simulation: My units are: kg, mm, ms, kN Formula used to calculate particle mass: c^3x density I selected Simple Cubic for SPH creation, so the Smoothing Length was set automatically. But on the help section of the homepage of Altair there are several formulas for calculating mp and h. Is it correct the way I´ve done it? SPH-Property: qa=1e-20 and qb=1e-20 For the air I chose material law LAW6 and I entered the following values: Air # RHO_I 1.22E-9 0 # Knu .015 # C0 C1 C2 C3 0 0 0 0 # Pmin Psh 0 1.0132E-4 # C4 C5 E0 .4 .4 2.533E-4 I changed the orientation of the surface segments in a way that their normal vectors point towards the interior of the domain. I defined DIST-inlet = 2xh Density function defined: time: 0, 1e30 ; density: 1, 1 For Fscale I entered my actual air density. I defined the velocity function: Time: 0, 500 ; Velosity: 50, 50 DIST-outlet = 2xh Pressure function: Time: 0, 1e30; Pressure: 1, 1 ; For Fscale I entered 0.005. I set for SPH the „SPH Particle Reserve“ Does SPHGLO-control card has an impact on my results and calculation time? i've also attached the files. Thank you. S-pipe_0000.rad S-pipe_0001.rad