Chpter20通用多相流模型(General Multiphase Models) 打印稿(9)

Phase exhaust fan outlet vent pressure outlet inlet vent intake fan mass flow inlet pressure inlet velocity inlet axis outflow periodic solid symmetry wall pressure far-field fan porous jump radiator fluid nothing coord. system; flow direction velocity nothing shear condition not available other source terms; other fixed values; other porous inputs volume fraction; gran. temperature coord. system; flow direction; volume fraction; gran. temperature velocity; volume fraction; gran. temperature nothing shear condition all others dir. spec. method; all others all others all others all others not available not available other source source terms terms; other fixed values; for turbulence; fixed values for turbulence; other porous porous zone; inputs porosity; all others Table 20.6.5: Phase-Specific and Mixture Conditions for the Eulerian Model (with the Dispersed

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Turbulence Model) Type exhaust fan outlet vent pressure outlet inlet vent intake fan mass flow inlet pressure inlet velocity inlet axis outflow periodic solid symmetry wall pressure far-field fan porous jump radiator fluid Primary Phase turb. parameters coord. system; flow direction; turb. parameters; velocity; turb. parameters nothing shear condition not available momentum, mass, turb. sources; momentum, mass, turb. fixed values; other porous inputs Secondary Phase volume fraction; gran. temperature coord. system; flow direction; volume fraction; gran. temperature velocity; volume fraction; gran. temperature nothing shear condition not available momentum and mass sources; momentum and mass fixed values; other porous inputs Mixture all others dir. spec. method all others all others all others all others not available porous zone; porosity; all others Table 20.6.6: Phase-Specific and Mixture Conditions for the Eulerian Model (with the Per-Phase Turbulence Model) Type exhaust fan Primary Phase turb. parameters Secondary Phase volume fraction; Mixture all others 42

outlet vent pressure outlet inlet vent intake fan mass flow inlet pressure inlet velocity inlet axis outflow periodic solid symmetry wall pressure far-field fan porous jump radiator fluid coord. system; flow direction; turb. parameters velocity; turb. parameters nothing shear condition not available momentum, mass, turb. sources; momentum, mass, turb. fixed values; other porous inputs turb. parameters; gran. temperature coord. system; flow direction; volume fraction; turb. parameters; gran. temperature velocity; volume fraction; turb. parameters; gran. temperature nothing shear condition not available momentum, mass, turb. sources; momentum, mass, turb. fixed values; other porous inputs dir. spec. method; all others all others all others all others not available porous zone; porosity; all others

设置边界条件的步骤： 你需要给每一个边界执行的步骤如下： 1. 在Boundary Conditions面板的Zone列表中选择边界； 2. 如果必要，在这个边界上为mixture设置条件。（见上述有关的需要为mixture设置条件的信息）。

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（a） In the Phase drop-down list, select mixture.

（b） If the current Type for this zone is correct, click Set… to open the corresponding panel(e.g., the Pressure

Inlet panel); otherwise, choose the correct zone type in the Type list, confirm the change(when prompted), and the corresponding panel will open automatically. （c） In the corresponding panel for the zone type you have selected(e.g., the Pressure Inlet panel, shown in

Figure 20.6.13), specify the mixture boundary conditions.

Figure 20.6.13: The Pressure Inlet Panel for a Mixture

注： 仅仅那些适用于所有相的条件，如上所述，将出现在这个面板中。 ！！对于VOF计算，如果你在Phase Interaction 面板中选择了Wall Adhesion,你能在wall上指定接触角为每一对相（as shown in Figure 20.6.14）.

Figure 20.6.14: The Wall Panel for a Mixture in a VOF Calculation with Wall Adhesion

接触角（?win Figure 20.2.2）就是壁面和接触面切线的夹角，量度了在Wall面板的成对的列表中第一相的值。例如，如果你设置oil和air相的接触角在Wall面板中（as shown in Figure 20.6.14）, ?w量度在oil相内。 对于所有对默认值是90度，就是没有壁面支持的影响（也就是，接触面垂直于支持面）。例如，接触角为45度，

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相当于水沿着容器面爬行，通常是水在玻璃上。

（d） Click OK when you are done setting the mixture boundary conditions.

(3)如果必要，在这个边界上为每一相设置条件。（上述有关必要为每一相设置条件的信息）。

（a） In the Phase drop-down list, select the phase (e.g., water). ！！注意：当你选择了单相中的一个（而不是mixture），只有一类区域出现在Type列表中。在给定的边界上是不可能指定phase-specific zone类的，这种区域类型是为mixture指定的，它也适用于所有的单相。 （b）Click Set... to open the panel for this phase's conditions (e.g., the Pressure Inlet panel, shown in Figure 20.6.15).

Figure 20.6.15: The Pressure Inlet Panel for a Phase

(c)Specify the conditions for the phase. Note that only those conditions that apply to the individual phase, as described above, will appear in this panel.

(d) Click OK when you are done setting the phase-specific boundary conditions.

复制边界条件的步骤：

为多相流动复制边界条件的步骤与在section6.1.5中描述的为单相流动的有些不同。修改的步骤如下：

1．In the Boundary Conditions panel, click the Copy... button. This will open the Copy BCs panel. 2．In the From Zone list, select the zone that has the conditions you want to copy. 3.In the To Zones list, select the zone or zones to which you want to copy the conditions. 4.In the Phase drop-down list, select the phase for which you want to copy the conditions (either mixture or one of the individual phases).

!! Note that copying the boundary conditions for one phase does not automatically result in the boundary conditions for the other phases and the mixture being copied as well. You need to copy the conditions for each phase on each boundary of interest. 5．Click Copy. FLUENT will set all of the selected phase's (or mixture's) boundary conditions

on the zones selected in the To Zones list to be the same as that phase's conditions on the zone selected in the From Zone list. (You cannot copy a subset of the conditions, such as only the thermal conditions.)

见section 6.1.5有更多的关于复制边界条件的信息，包括限制。 20.6.15 设置初始容积比率

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