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Copy file name to clipboardExpand all lines: Manuals/FDS_Verification_Guide/FDS_Verification_Guide.tex
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@@ -4421,7 +4421,7 @@ \subsection{Gravitational Settling and Deposition of Aerosols\\(\texorpdfstring{
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\subsection{Thermophoretic Settling and Deposition of Aerosols\\(\texorpdfstring{\ct{aerosol_thermophoretic_deposition}}{aerosol\_thermophoretic\_deposition})}
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\label{aerosol_thermophoretic_deposition}
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This verification test consists of two test cases. The second case, \ct{aerosol\_thermophoretic\_deposition\_2}, reverses the temperature gradient. The case consists of a box 1~cm on side with adiabatic, free-slip side walls and a 100 K temperature gradient over the height of the box. The box is filled with two gas species each having a molecular weight of 28.8~g/mol, a viscosity of 0.00002~\si{kg/(m.s}, a thermal conductivity of 0.025~\si{W/(m.K}, and specific heat of 1~\si{kJ/(kg.K}, and zero diffusivity. One of the gas species is defined as an aerosol with a diameter of 1~$\mu$m, a solid phase density of 2000~kg/m$^3$, and a solid phase conductivity of 1~\si{W/(m.K}. The initial mass fraction of the aerosol is 0.00001. The gas temperature is initialized to its steady-state temperature gradient. \ct{STRATIFICATION}, \ct{NOISE}, and all aerosol behaviors except for \ct{THERMOPHORETIC\_SETTLING} and \ct{THERMOPHORETIC\_DEPOSITION} are turned off. Thermophoretic settling rates are weakly dependent on the gas density. Since there is a temperature gradient, the settling rates are not uniform over the height of the box. Unlike the gravitational settling case, this means over long enough time periods the overall settling rate is not linear in time; however, for a short time period a near linear settling rate is expected and can be determined analytically
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This verification test consists of two test cases. The second case, \ct{aerosol\_thermophoretic\_deposition\_2}, reverses the temperature gradient. The case consists of a box 1~cm on a side with adiabatic, free-slip side walls and a 100 K temperature gradient over the height of the box. The box is filled with two gas species each having a molecular weight of 28.8~g/mol, a viscosity of $2\times10^{-5}$~\si{kg/(m.s)}, a thermal conductivity of 0.025~\si{W/(m.K)}, and specific heat of 1~\si{kJ/(kg.K)}, and zero diffusivity. One of the gas species is defined as an aerosol with a diameter of 1~$\mu$m, a solid phase density of 2000~\si{kg/m^3}, and a solid phase conductivity of 1~\si{W/(m.K)}. The initial mass fraction of the aerosol is $1\times10^{-5}$. The gas temperature is initialized to its steady-state temperature gradient. \ct{STRATIFICATION}, \ct{NOISE}, and all aerosol behaviors except for \ct{THERMOPHORETIC\_SETTLING} and \ct{THERMOPHORETIC\_DEPOSITION} are turned off. Thermophoretic settling rates are weakly dependent on the gas density. Since there is a temperature gradient, the settling rates are not uniform over the height of the box. Unlike the gravitational settling case, this means over long enough time periods the overall settling rate is not linear in time; however, for a short time period a near linear settling rate is expected and can be determined analytically.
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\begin{figure}[ht]
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\noindent
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\subsection{Turbulent Deposition of Aerosols (\texorpdfstring{\ct{aerosol\_turbulent\_deposition}}{aerosol\_turbulent\_deposition})}
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\label{aerosol_turbulent_deposition}
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This verification test consists of three tunnel like geometries 10~cm on side with adiabatic, free-slip walls. One end of the tunnel is \ct{OPEN} and the other end has a constant inlet velocity of 0.001 m/s, 0.1 m/s, or 1 m/s. The tunnels are filled with two gas species each having a molecular weight of 28.8~g/mol, a viscosity of 0.00002~\si{kg/(m.s)}, a thermal conductivity of 0.025~\si{W/(m.K)}, and specific heat of 1~\si{kJ/(kg.K)}, and zero diffusivity. One of the gas species is defined as an aerosol with a diameter of 100~$\mu$m, a solid phase density of 2000~kg/m$^3$, and a solid phase conductivity of 1~\si{W/(m.K}. The initial mass fraction of the aerosol is 0.00001. \ct{STRATIFICATION}, \ct{NOISE}, and all aerosol behaviors except for \ct{TURBULENT\_DEPOSITION} are turned off. Turbulent deposition is computed using a correlation based open the wall friction velocity and the wall dimensionless stopping distance. The correlation has three parts, and the selected velocities test each part. Since the inlet condition is a constant velocity with a constant aerosol mass fraction, the first wall cell after the inlet will see a uniform settling rate over time.
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This verification test consists of three tunnel like geometries 10~cm on side with adiabatic, free-slip walls. One end of the tunnel is \ct{OPEN} and the other end has a constant inlet velocity of 0.001 m/s, 0.1 m/s, or 1 m/s. The tunnels are filled with two gas species each having a molecular weight of 28.8~g/mol, a viscosity of $2\times10^{-5}$~\si{kg/(m.s)}, a thermal conductivity of 0.025~\si{W/(m.K)}, and specific heat of 1~\si{kJ/(kg.K)}, and zero diffusivity. One of the gas species is defined as an aerosol with a diameter of 100~$\mu$m, a solid phase density of 2000~\si{kg/m^3}, and a solid phase conductivity of 1~\si{W/(m.K}. The initial mass fraction of the aerosol is $1\times10^{-5}$. \ct{STRATIFICATION}, \ct{NOISE}, and all aerosol behaviors except for \ct{TURBULENT\_DEPOSITION} are turned off. Turbulent deposition is computed using a correlation based open the wall friction velocity and the wall dimensionless stopping distance. The correlation has three parts, and the selected velocities test each part. Since the inlet condition is a constant velocity with a constant aerosol mass fraction, the first wall cell after the inlet will see a uniform settling rate over time.
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