- Can a 2 mm distance (between YMIN AVERAGE and POINT PROBE) has this different gas velocity?
Yes. Again, you should not compare the inlet velocity (where void fraction is one) with the gas velocity in the bed (where the void fraction is less than one). For example if the inlet velocity is 0.7m/s and the void fraction in the bed is 0.5, then the gas velocity at that point won’t be 0.7m/s but close to 0.7/0.5=1.4 m/s due to the volume occupied by solids.
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If YMIN AVERAGE is working correct, why pressure is always 101320, when bed is vigorously bubbling?
YMIN AVERAGE gives you the velocity at y=ymin, but it correspond to the ghost cell just below y=ymin because the y-velocity is stored at the north face of the cell (staggered grid representation). The pressure is stored at the cell center. The value 101320 is not applied but used to compute gas density. The pressure you want to use for a pressure drop calculation is the pressure at the first fluid cell above the inlet and the pressure at the outlet (outflow pressure). -
Zero pressure drop across bed as this is PressureOutflow value?
See answer to 2)