Q
I have set up a problem in which the flow is buoyant and a gravity vector is specified. I would like to know whether this setting in the domain will automatically apply gravity to my particles, or whether some other setting is required.
A
To apply gravity to the particles you need to do two things:
1. define the flow as buoyant with a gravity vector, e.g.
DOMAIN: Domain 1
DOMAIN MODELS:
BUOYANCY MODEL:
Buoyancy Reference Density = 1 [kg m^-3]
Gravity X Component = 0 [m s^-2]
Gravity Y Component = 0 [m s^-2]
Gravity Z Component = -9.8 [m s^-2]
Option = Buoyant
BUOYANCY REFERENCE LOCATION:
Option = Automatic
END
END
DOMAIN MOTION:
Option = Stationary
END
REFERENCE PRESSURE:
Reference Pressure = 1 [atm]
END
END
2. set the buoyancy for the particle phase, e.g.
FLUID: Aluminium
FLUID MODELS:
FLUID BUOYANCY MODEL:
Option = Density Difference
END
MORPHOLOGY:
Option = Dispersed Particle Transport Solid
PARTICLE DIAMETER DISTRIBUTION:
Diameter = 0.001 [m]
Option = Specified Diameter
ENDEND
END
END
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Q I have set up a problem in which the flow is buoyant and a gravity vector is specified. I would like to know whether this setting in the domain will automatically apply gravity to my particles, or whether some other setting is required. A To apply gravity to the particles you need to do two things: 1. define the flow as buoyant with a gravity vector, e.g. DOMAIN: Domain 1 DOMAIN MODELS: BUOYANCY MODEL: Buoyancy Reference Density = 1 [kg m^-3] Gravity X Component = 0 [m s^-2] Gravity Y Component = 0 [m s^-2] Gravity Z Component = -9.8 [m s^-2] Option = Buoyant BUOYANCY REFERENCE LOCATION: Option = Automatic END END DOMAIN MOTION: Option = Stationary END REFERENCE PRESSURE: Reference Pressure = 1 [atm] END END 2. set the buoyancy for the particle phase, e.g. FLUID: Aluminium FLUID MODELS: FLUID BUOYANCY MODEL: Option = Density Difference END MORPHOLOGY: Option = Dispersed Particle Transport Solid PARTICLE DIAMETER DISTRIBUTION: Diameter = 0.001 [m] Option = Specified Diameter ENDEND END END |
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