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Author: Daniel Kantor and Andrew Einstein, Cornell University Problem Specification |
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Lab Apps > FLUENT 6.3.26
Select 3ddp from the list of options and click Run.
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The "3ddp" option is used to select the 3-dimensional, double-precision solver. In the double-precision solver, each floating point number is represented using 64 bits in contrast to the single-precision solver which uses 32 bits. The extra bits increase not only the precision but also the range of magnitudes that can be represented. The downside of using double precision is that it requires more memory. |
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Navigate to the working directory and select the SingleSphere.msh file. This is the mesh file that was created using the preprocessor GAMBIT in the previous step. FLUENT reports the mesh statistics as it reads in the mesh:
Check the number of nodes, faces (of different types) and cells. Also, take a look under zones. We can see the three zones inlets, outlet, and sphere that we defined in GAMBIT.
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Make sure we select our surface under Surfaces. Then click Display. The graphics window opens and the grid is displayed in it. You can now click Close in the Grid Display menu to get back some desktop space. The graphics window will remain.
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Translation: The grid can be translated in any direction by holding down the Left Mouse Button and then moving the mouse in the desired direction. |
Use these operations to zoom into the grid to obtain the view shown below.
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To get white background go to: |
You can also look at specific parts of the grid by choosing the boundaries you wish to view under Surfaces (click to select and click again to deselect a specific boundary). Click Display again when you have selected your boundaries.
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Main Menu > Define > Models > Solver
Choose Pressure Based under Solver, Absolute under Velocity Formulation, Green-Gauss Node Based under Gradient Option, Unsteady under Time , 2nd-Order Implicit under Unsteady Formulation, and Superficial Velocity under Porous Formulation.
Main Menu > Define > Models > Viscous
Choose k-omega Model and check the SST. Leave all other values alone.
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For incompressible flow, the energy equation is decoupled from the continuity and momentum equations. We need to solve the energy equation only if we are interested in determining the temperature distribution. We will not deal with temperature in this example. So leave the Energy Equation unselected and click Cancel to exit the menu.
Define Material Properties
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The default values are the ones that we are going to use so we do not need to change anything here. These are the values that we specified under Problem Specification.
Click Change/Create. Close the window.
Define Operating Conditions
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For all flows, FLUENT uses gauge pressure internally. Any time an absolute pressure is needed, it is generated by adding the operating pressure to the gauge pressure. We'll use the default value of 1 atm (101,325 Pa) as the Operating Pressure.
Click Cancel to leave the default in place.
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Main Menu > Define > Boundary Conditions...
Select Inlets and click Set. We should set Velocity Specification Method to Components, and set X-velocity to 2.7754. In the Turbulence Area, we should set Specification Method to Intensity and Length Scale, and set Turbulent Intensity to 1.
All other Boundary Conditions have been set during the meshing process so nothing else should be modified here.
Click Close to close the Boundary Conditions menu.
Go to Step 5: Solve!
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