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# void fraction negatif

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hi

i m trying to run interFoam solver but i see that volume fraction under zero

smoothSolver:  Solving for alpha.water, Initial residual = 3.57599e-06, Final residual = 1.53736e-10, No Iterations 1
Phase-1 volume fraction = -1.70339e-07  Min(alpha1) = -0.0117843  Max(alpha1) = 1
MULES: Correcting alpha.water
DICPCG:  Solving for p_rgh, Initial residual = 0.0702105, Final residual = 0.00350965, No Iterations 15
time step continuity errors : sum local = 5.78837e-10, global = 6.94181e-22, cumulative = 3.66196
DICPCG:  Solving for p_rgh, Initial residual = 0.0508963, Final residual = 0.00249176, No Iterations 344
ExecutionTime = 5860.9 s  ClockTime = 5926 s

smoothSolver:  Solving for alpha.water, Initial residual = 3.66996e-06, Final residual = 1.92495e-10, No Iterations 1
Phase-1 volume fraction = -1.71841e-07  Min(alpha1) = -0.0117813  Max(alpha1) = 1
MULES: Correcting alpha.water
DICPCG:  Solving for p_rgh, Initial residual = 0.0505673, Final residual = 0.00226451, No Iterations 382
time step continuity errors : sum local = 7.86302e-10, global = 2.78746e-22, cumulative = 3.66196
DICPCG:  Solving for p_rgh, Initial residual = 0.754927, Final residual = 0.026304, No Iterations 3
time step continuity errors : sum local = 7.22643e-09, global = -3.92847e-23, cumulative = 3.66196

i dont understand better this if some one can expain

thanks 