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- - **Floating point error：invalid number**
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Floating point error：invalid numberHi,
there is an cube submerged in water,its interior is also filled with water.the outlet is on the cube's bottom,the inlet connected to a air compressor is on the cube's top.my object is to obtain how long can the water in the cube be evacuated.but when I start iterate,it show that "Floating point error：invalid number".can anyone help me? thanks in advance. The solve settings are as follow: FLUENT Version: 3d, pbns, vof, ske, unsteady (3d, pressure-based, VOF, standard k-epsilon, unsteady) Release: 6.3.26 Title: Models ------ Model Settings ---------------------------------------------------------------- Space 3D Time Unsteady, 1st-Order Implicit Viscous Standard k-epsilon turbulence model Wall Treatment Standard Wall Functions Boundary Conditions ------------------- Zones name id type --------------------------------------- fluid 2 fluid wall 3 wall outlet 4 pressure-outlet [Gauge Pressure=50662Pa,Backflow Volume Fraction(water)=0] inlet 5 mass-flow-inlet [Supersonic/Initial Gauge Pressure=202650Pa,Mass Flow-Rate(air)=0.01Kg/s,Mass Flow-Rate(water)=0 Kg/s] default-interior 7 interior Pressure-Velocity Coupling Parameter Value ----------------------------------- Type PISO Skewness-Neighbour Coupling yes Skewness Correction 1 Neighbour Correction 1 Discretization Scheme Variable Scheme ------------------------------------------------ Pressure Body Force Weighted Momentum First Order Upwind Volume Fraction Geo-Reconstruct Turbulent Kinetic Energy First Order Upwind Turbulent Dissipation Rate First Order Upwind |

Hi there,
Usually, this is due to a division per zero. A common exemple arrive when in you're reference panel, you set reference velocity to zero and you try to compute drag coefficient. You then got that type of error. Another common exemple is when you're using ideal law but you're operating pressure is set to zero!. Best regards Martin |

Thanks for your reply.
I have already examined the model settings and boundary conditions.The same model setting and boundary condition in 2D case do not result in similar problem,although the final result may be wrong. while they are used in 3D case,Fluent shows that "Floating point error：invalid number". By the way,is mass flow inlet boundary applicable for the outlet of air compressor?Usually we konw the air delivery(L/min) and air pressure(PSI) of an air compressor. |

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