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Setup and Solution

16.4.9. Solution

1.Increase the under-relaxation factor for Discrete Phase Sources.

Solution → Controls → Controls...

In the Pseudo Transient Explicit Relaxation Factors group box, change the under-relaxation factor for Discrete Phase Sources to 0.9.

2.Remove the convergence criteria.

Solution → Reports → Residuals...

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a.Select none from the Convergence Criterion drop-down list.

b.Click OK to close the Residual Monitors dialog box.

3.Enable the plotting of mass fraction of ch3oh.

Solution → Reports → Definitions → New → Surface Report → Mass-Weighted Average...

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Setup and Solution

a.Enter ch3oh_outlet for Name of the surface report definition.

b.In the Create group box, enable Report Plot and Print to Console.

c.Select Species... and Mass fraction of ch3oh from the Field Variable drop-down lists.

d.Select outlet from the Surfaces selection list.

e.Click OK to save the surface report definition settings and close the Surface Report Definition dialog box.

Fluent automatically generates the ch3oh_outlet-rplot report plot under the Solution/Monitors/Report Plots tree branch.

4.Enable the plotting of the sum of the DPM Mass Source.

Solution → Reports → Definitions → New → Volume Report → Sum...

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a.Enter dpm-mass-source for Name.

b.In the Create group box, enable Report Plot and Print to Console.

c.Select Discrete Phase Sources... and DPM Mass Source from the Field Variable drop-down lists.

d.Select fluid from the Cell Zones selection list.

e.Click OK to save the volume report definition settings and close the Volume Report Definition dialog box.

Fluent automatically generates the dpm-mass-source-rplot report plot under Solution/Monitors/Report Plots tree branch.

f.Modify the attributes of the dpm-mass-source-rplot report plot axes.

Solution → Monitors → Report Plots → dpm-mass-source-rplot Edit...

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Setup and Solution

i.In the Plot Window group box, click the Axes... button to open the Axes dialog box.

ii. Select Y in the Axis list.

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iii.Select exponential from the Type drop-down list.

iv.Set Precision to 2.

v.Click Apply and close the Axes dialog box.

vi.Click OK to close the Edit Report Plot dialog box.

5.Create a DPM report definition for tracking the total mass present in the domain.

Solution → Reports → Definitions → New → DPM Report → Mass in Domain...

a.Enter dpm-mass-in-domain for Name.

b.In the Create group box, enable Report Plot and Print to Console.

c.Select injection-0 from the Injections selection list.

d.Clear Show Mass Flow / Change Rate.

e.Click OK to save the volume report definition settings and close the DPM Report Definition dialog box.

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Setup and Solution

Fluent automatically generates the dpm-mass-in-domain-rplot report plot under Solution/Monitors/Report Plots tree branch.

f.Modify the attributes of the dpm-mass-in-domain-rplot report plot axes (in a manner similar to that for the dpm-mass-source-rplot plot).

Solution → Monitors → Report Plots → dpm-mass-in-domain-rplot Edit...

i.In the Plot Window group box, click the Axes... button to open the Axes dialog box.

ii.Select Y in the Axis list.

iii.Select exponential from the Type drop-down list.

iv.Set Precision to 2.

v.Click Apply and close the Axes dialog box.

vi.Click OK to close the Edit Report Plot dialog box.

6.Create a DPM report definition for tracking the mass of the evaporated particles.

Solution → Reports → Definitions → New → DPM Report → Evaporated Mass...

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a.Enter dpm-evaporated-mass for Name.

b.In the Create group box, enable Report Plot and Print to Console.

c.Select injection-0 from the Injections selection list.

d.Ensure that the Show Mass Flow / Change Rate option is selected.

e.Click OK to save the volume report definition settings and close the DPM Report Definition dialog box.

Fluent automatically generates the dpm-evaporated-mass-rplot report plot under Solution/Monitors/Report Plots tree branch.

f.Modify the attributes of the dpm-evaporated-mass-rplot report plot axes in a manner similar to that for the dpm-mass-source-rplot plot.

7.Request 300 more iterations (Figure 16.6: Convergence History of Mass Fraction of ch3oh on Fluid (p. 585), Figure 16.7: Convergence History of DPM Mass Source on Fluid (p. 585), Figure 16.8: Convergence History of Total Mass in Domain (p. 586), and Figure 16.9: Convergence History of Evaporated Particle Mass (p. 586)).

Solution → Run Calculation

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Setup and Solution

It can be concluded that the solution is converged because the number of particle tracks are constant and the flow variable plots are flat.

Figure 16.6: Convergence History of Mass Fraction of ch3oh on Fluid

Figure 16.7: Convergence History of DPM Mass Source on Fluid

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