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Setup and Solution |
a.Retain the default setting of 0 for Gauge Pressure.
b.In the Turbulence group box, select Intensity and Hydraulic Diameter from the Specification Method drop-down list.
c.Retain the default value of 10% for the Backflow Turbulent Intensity.
d.Enter 40 mm for the Backflow Hydraulic Diameter.
e.Click OK to close the Pressure Outlet dialog box.
4.Retain the remaining default (wall and interior) boundary conditions.
1.4.9. Solution
1.Specify the discretization schemes.
In the Solution ribbon tab, click Methods... (Solution group box).
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Solution → Solution → Methods...
a.Retain the default selection of Coupled from the Scheme drop-down list.
b.Retain the default selection of Least Squares Cell Based from the Gradient drop-down list in the
Spatial Discretization group box.
c.Retain the default selection of Second Order Upwind from the Momentum drop-down list.
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Setup and Solution |
d.Retain the default selection of Pseudo Transient.
e.Retain the default selection of Warped-Face Gradient Correction.
2.Create a surface report definition of the velocity at the outlet (outlet).
Solution → Reports → Definitions → New → Surface Report → Facet Maximum...
Note
You can also access the Surface Report Definition dialog box by right-clicking Report Definitions in the tree (under Solution) and selecting New/Surface Report/Facet Maximum... from the menu that opens.
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a.Enter point-vel for the Name of the report definition.
b.Enable Report File, Report Plot, and Print to Console in the Create group box.
During a solution run, ANSYS Fluent will write solution convergence data in a report file, plot the solution convergence history in a graphics window, and print the value of the report definition to the console.
c.Select Velocity... and Velocity Magnitude from the Field Variable drop-down lists.
d.Select outlet from the Surfaces selection list.
e.Click OK to save the surface report definition and close the Surface Report Definition dialog box.
The new surface report definition point-vel will appear under the Solution/Report Definitions tree item. ANSYS Fluent also automatically creates the following items:
•point-vel-rfile (under the Solution/Monitors/Report Files tree branch)
•point-vel-rplot (under the Solution/Monitors/Report Plots tree branch)
3.Monitor the mass flow rate at the inlets.
Solution → Reports → Definitions → New → Flux Report → Mass Flow Rate...
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Setup and Solution |
a.Enter mass-in for the Name of the report definition.
b.Select Mass Flow Rate under Options.
c.Select in1, in2, in3, as well as inlet, inlet1, inlet2 from the Boundaries selection list.
d.Enable Report File, Report Plot, and Print to Console in the Create group box.
e.Click OK to save the surface report definition and close the Flux Report Definition dialog box.
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The new surface report definition mass-in tree item. ANSYS Fluent also automatically
will appear under the Solution/Report Definitions creates the following items:
•mass-in-rfile (under the Solution/Monitors/Report Files tree branch)
•mass-in-rplot (under the Solution/Monitors/Report Plots tree branch)
4.Monitor the total mass flow rate through the entire domain.
Perform the same procedure as described above, naming the report mass-tot, and selecting all boundaries.
5.Monitor the mass balance.
Use expressions to create a report definition for the mass balance using existing report definitions.
Solution → Reports → Definitions → New → Expression...
This opens the Expression Report Definition dialog box.
a.Select mass-tot from the Select Operand Field Functions from drop-down list.
b.Select the / operand.
c.Select mass-in from the Select Operand Field Functions from drop-down list.
d.Enter mass-bal for the Name of the expression.
e.Enable Report File, Report Plot, and Print to Console in the Create group box.
f.Click Define to save the expression definition and close the Expression Report Definition dialog box.
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Setup and Solution |
6.Initialize the flow field using the Initialization group box of the Solution ribbon tab.
Solution → Initialization
a.Retain the default selection of Hybrid from the Method list.
b.Click Initialize.
7.Save the case file (manifold_solution.cas).
File → Write → Case...
8.Start the calculation by requesting 100 iterations in the Solution ribbon tab (Run Calculation group box).
Solution → Run Calculation
a.Enter 100 for No. of Iterations.
b.Click Calculate to begin the iterations.
As the solution progresses, the mass flow rate graph flattens out, as seen in Figure 1.2: Mass Flow Rate History (p. 26).
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