- #SOLIDWORKS FLOW SIMULATION 2015 HOW TO#
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SOLIDWORKS Flow Simulation reports a final pressure of 11.45 psi, equal to aĭrop of 1.05 psi. So what effect did this drop in temperature have on the ball pressure? So what are the results? Assuming a time out on the field of 60 minutes, orģ600 seconds, the cold New England conditions would in fact cool the ball downĪ lot, to about 52.5 degrees, but not quite as cold as others have assumed. Pressure, just the same as any of the NFL referees would have seen.
#SOLIDWORKS FLOW SIMULATION 2015 PLUS#
In this case I selected theĪverage temperature and average static pressure on the inside faces of theīall, plus created my own custom Equation goal which will report gauge Which allow me to quickly see the key results. Other words, the absolute pressure is 14.64 + 12.5 = 27.14 psi.īefore running the analysis, I made sure to set up some Goals in my project, Flow Simulation always uses absolute pressure in its setup and results, soĪ “gauge” pressure of 12.5 psi really means 12.5 psi above atmospheric. The pressure box, but don’t worry- I haven’t pulled a Note here that I’ve typed in 27.14 psi in Same conditions the minute it’s brought out onto the cold field, barring any Locker room (I guessed 73˚ F), the air inside the ball should still have those If the ball was really inflated to the league-minimum 12.5 psi inside the warm The air inside the ball, by creating what’s called a Fluid Subdomain. Would have been flying through the air a good part of the time (cooling itĮven faster), I also ignored the heat that might have been added to the ballĪt this point, the only remaining task was to enter the initial conditions of Even though there would have been some wind, and the ball We also have the option in Flow Simulation to set a wind speed, but here I The game time field conditions in Foxborough were reportedly 51 degreesįahrenheit, with an atmospheric pressure of 14.64 psi (slightly below normal). Those materials don’t exist in the default engineering database, so IĬreated a custom material with a thermal conductivity of 0.2 W/m-K, similar toīoth rubber and leather which have good insulation.įinally, it’s important to select the proper initial and ambient conditions. Nowadays is constructed of a synthetic leather with a bladder lining the Under Solids, we’d need to choose the material for the ball, which On the Fluids tab, I selected the pre-defined model for air no further work Selected since I need to know how quickly these temperature changes would On the field, thereby cooling the air inside. Solids needs to be turned on so we can simulate the pigskin cooling down once The natural air currents around the outside of the ball. Going through the setup wizard of our first project, we need to make sure toĮnable the key physical conditions that make for an accurate simulation.įirst, I selected an External analysis and enabled Gravity so we can simulate
#SOLIDWORKS FLOW SIMULATION 2015 HOW TO#
To start with, we need a 3D model of a football, which luckily I know how to SOLIDWORKS Flow Simulation, our embedded Luckily, a heat transfer problem like this is just the of type thing Makes one big assumption: that the temperature of the air inside the ballĪctually would cool down to the same temperature as the air on theįield. Predicts at least some of the reported pressure drop, but using this equation In this case, it does appear that the ideal gas law We in the world of simulation are aware of both the power and the limitations To estimate that “a 5 to 10 percent dip in temperature could bring about aĭrop of 0.5 to 1.5 pounds per square inch, or psi, in a ball’s air pressure.” Join over thousands happy readers, and cancel the membership at anytime as you like if not feel satisfied.Professor Richard P.
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