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The Virtual Manikin Project Andy Buxton Adrian Huggins & David Glynn.

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Presentation on theme: "The Virtual Manikin Project Andy Buxton Adrian Huggins & David Glynn."— Presentation transcript:

1 The Virtual Manikin Project Andy Buxton Adrian Huggins & David Glynn

2 The Defence Evaluation & Research Agency zThis work was carried out as part of Technology Group 5 (Human Sciences and Synthetic Environments) of the MoD Corporate Research Programme

3 DERAs Ultimate Customers: the Front Line

4 Fundamentals of heat stress Climate Clothing Physical work

5 Experiment or Model? zExperimental methods –Laboratory or field based zExpensive zSpecific zPossibly hazardous

6 Instrumented manikins for clothing evaluation zThermal manikin –Thermal resistance (insulation) zSweating manikin –Evaporative resistance

7 Virtual Manikin Project Objectives zCreate a tool for modelling and assessing potentially hazardous environments zCreate a tool for assessing clothing systems prior to construction zReduce costs and time-scales for equipment procurement

8 Geometry - STL file produced by laser scanning

9 Cartesian grid details zGrid dimension – 38x52x56 zDomain dimension –2.5 x 2.0 x 1.9 m

10 Boundary Conditions & Source Terms zOpen pressure boundary conditions at front, sides and top of domain zInlet boundary condition specified at front for forced convection case zInitial and inlet temperatures 20 o C zBouyancy forces represented using Boussinesq model zk-e turbulence model used zManikin heat source: CO=1.E+5,VAL=34 o C

11 Air movement and temperature contours

12 Predicted manikin heat loss

13 Human thermo-physiological model

14 Information exchange zVirtual Manikin-CFD model calculates local boundary conditions for physiological model zPhysiological model dictates heat and mass (sweat) sources for the CFD model Virtual Manikin - CFD model Thermo-physiological model

15 Information flow Flow calculation Calculation of local boundary conditions 2-D Thermal model Calculation of segmental heat and mass sources Initial conditions CFD model

16 Current PARSOL treatment zPARSOL currently treats fluid flow differently from heat transfer (see figures) zFluid - Solid interfaces are treated correctly as a spline for fluid flow and as a staircase for heat transfer zThere can only be one fluid- solid interface in a given mesh cell SOLID FLUID SOLID FLUID

17 Extended PARSOL treatment Fluid Solid Fluid

18 Clothing simulation zThe clothing model will require integration of a number of features in PHOENICS –Moving objects –Stress-Strain –Fluid flow –Heat transfer zPre-existing algorithms will be used for the deformation of clothing

19 Summary - 1 zAn STL file of a manikin was produced by laser scanning zThis was imported into PHOENICS zFlow simulations were produced and heat transfer predictions made zFurther grid refinement is required zA parallel cluster of PCs will be used for future work

20 Summary - 2 zThe CFD model will be linked to a human thermo- physiological model zMore complex environments will be evaluated, e.g. vehicles, aircraft zPARSOL will be enhanced:- –Unify current treatment of Fluid Flow and Heat Transfer –Extend PARSOL to allow multiple interfaces in any given cell –The extended PARSOL feature will be available to all PHOENICS users

21 Points of contact Andy Buxton,David Glynn, Protection and Performance Department, Flowsolve Ltd. Centre for Human Sciences,Arthur Road, DERA, Ively Road, Wimbledon Park, HANTS. GU14 OLX. Tel United KingdomFax Tel Fax

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