问题补充：
哪位大侠知道fluent中用欧拉模型模拟固液两相流时,interaction中的drag coefficient怎么设置?fluent中用欧拉模型模拟固液两相流时,interaction中的drag coefficient怎么设置?schiller-naumann适用于什么条件?syamlal-obrien呢?这些怎么选?
答案：
Specifying the Drag Function
FLUENT 允许你为一对相指定曳力函数,步骤如下：
1．Click the Drag tab to display the Drag Function inputs.
2. 对每一对相,从下面相应的列表中选择合适的曳力函数.
（1） Select schiller-naumann to use the fluid-fluid drag function described by
Equation 20.4-19. The Schiller and Naumann model is the default method, and it
is acceptable for general use in all fluid-fluid multiphase calculations.
（2） Select morsi-alexander to use the fluid-fluid drag function described by
Equation 20.4-23. The Morsi and Alexander model is the most complete,
adjusting the function definition frequently over a large range of Reynolds numbers,
but calculations with this model may be less stable than with the other models.
（3） Select symmetric to use the fluid-fluid drag function described by
Equation 20.4-28. The symmetric model is recommended for flows in which the
secondary (dispersed) phase in one region of the domain becomes the primary
(continuous) phase in another. For example, if air is injected into the bottom of a
container filled halfway with water, the air is the dispersed phase in the bottom half
of the container; in the top half of the container, the air is the continuous phase.
（4） Select wen-yu to use the fluid-solid drag function described by Equation 20.4-40.
The Wen and Yu model is applicable for dilute phase flows, in which the total
secondary phase volume fraction is significantly lower than that of the primary
phase.
（5） Select gidaspow to use the fluid-solid drag function described by
Equation 20.4-42. The Gidaspow model is recommended for dense fluidized beds.
（6） Select syamlal-obrien to use the fluid-solid drag function described by
Equation 20.4-32. The Syamlal-OBrien model is recommended for use inconjunction with the Syamlal-OBrien model for granular viscosity.
（7） Select syamlal-obrien-symmetric to use the solid-solid drag function described by
Equation 20.4-44. The symmetric Syamlal-OBrien model is appropriate for a pair
of solid phases.
（8） Select constant to specify a constant value for the drag function, and then specify
the value in the text field.
（9） Select user-defined to use a user-defined function for the drag function (see the
separate UDF Manual for details).
（10） If you want to temporarily ignore the interaction between two phases, select none.
Specifying the Restitution Coefficients (Granular Flow Only)
对颗粒流,你必须为颗粒间的碰撞指定归还系数.除了为每一对颗粒相之间的碰撞指定归还系数外,你也得为同相颗
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