本文摘要(由AI生成):
本案例利用Rocky DEM软件模拟了两种不同粒径颗粒的混合过程。首先,在SCDM中准备几何模型,并在Rocky DEM中设置物理参数,包括重力加速度和容器。接着,创建粒子入射口,设置不同时间段的入射颗粒类型和速度。然后,定义颗粒材料和颗粒与边界的相互作用参数。最后,创建并设置颗粒类型和注射方式,开始计算并得到模拟结果。该案例通过详细的步骤展示了利用Rocky DEM软件进行颗粒混合过程仿真的全过程。
本案例演示利用Rocky DEM软件仿真模拟两种不同粒径颗粒的混合过程。
1 几何准备
在SCDM中准备如下图所示的几何模型,以STL格式输出。![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578258976047122.png?imageView2/0)
2 Rocky DEM设置
2.1 物理设置
- 启动Rocky DEM,新建工程文件Mixer.rocky30
- 选择节点Physics,指定重力加速度方向为Z方向-9.81 m/s2
![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578259043094105.png?imageView2/0)
2.1 导入容器
- 右键选择节点Geometries,点击弹出菜单项Import Custom Geometry弹出文件选择对话框,选择几何文件Mixer.stl后自动弹出文件导入选项
![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578259112089973.png?imageView2/0)
- 如下图所示激活选项Convert Y and Z axes,设置参数Import Unit为mm
![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578259179003523.png?imageView2/0)
- 右键选择节点Mixer<01>,点击弹出菜单项Show in new → 3D View打开新的图形显示窗口
![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578259252033282.png?imageView2/0)
![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578259323081455.png?imageView2/0)
- 右键选择模型树节点Motion Frames,点击弹出菜单项Create Motion Frame创建运动方式Frame01
![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578259401019615.png?imageView2/0)
- 如下图所示设置运动方式为沿X轴转动,旋转速度为3.76991 rad/s
![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578259466095739.png?imageView2/0)
注:rocky 4.2版本采用的这种定义运动速度的方式可以指定旋转轴,而在早期版本3.11中无法指定任意旋转轴。
- 设置Mixer<01>的属性,如下图所示设置参数Motion Frame为Frame 01
![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578259523027543.png?imageView2/0)
2.2 创建粒子入射口
- 右键选择模型树节点Geometries,点击弹出菜单项Create Inlet创建入射口inlet<01>
![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578259587099572.png?imageView2/0)
![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578259704034993.png?imageView2/0)
- 如下图所示设置入射口inlet<01>的物理属性,设置颗粒入射速度为1 m/s,入射时间为0 ~ 0.5 s
![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578259763083819.png?imageView2/0)
- 如下图所示拷贝入射口inlet<01>,其命名为inlet<02>
![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578259847051586.png?imageView2/0)
- 如下图所示设置入射口inlet<02>的颗粒入射时间为0.5~1 s
![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578260056063456.png?imageView2/0)
2.3 Materials设置
- 点击模型树节点Default Boundary,如下图所示修改其名称为Steel,其他参数保持默认设置
![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578260113003130.png?imageView2/0)
- 如下图所示,点击模型树节点Default Particles,如下图所示修改其名称为Particle,设置其密度为2000 kg/m3,其他参数保持默认设置
![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578260168001463.png?imageView2/0)
2.4 Materials Interaction
- 点击模型树节点Materials Interaction,如下图所示设置材料Particles - Particles 作用参数
![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578260261051880.png?imageView2/0)
- 如下图所示设置材料Particle - Steel 作用参数
![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578260337056786.png?imageView2/0)
2.5 创建颗粒
- 右键选择模型树节点Particles,点击弹出菜单项Create Particle
![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578260392027317.png?imageView2/0)
- 如下图所示设置新创建的颗粒属性,指定其名称为Tablet_3mm,设置其粒径为0.003 m
![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578260465066901.png?imageView2/0)
![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578260530023944.png?imageView2/0)
- 修改拷贝的颗粒节点,修改其名称为Tablet_5mm及粒径为0.005 m
![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578260610040057.png?imageView2/0)
2.6 注射颗粒
- 右键选择节点Input,点击弹出菜单项Create Particle Input创建入射Particle Input<1>
![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578260681094923.png?imageView2/0)
- 如下图所示设置注入Tablet_3mm颗粒质量流量为0.5 kg/s
![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578260734033412.png?imageView2/0)
- 如下图所示复制Particle Input<1>,其自动命名为Particle Input<2>
![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578260785071636.png?imageView2/0)
- 如下图所示设置Particle Input<2>的入射参数
![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578260846032880.png?imageView2/0)
2.7 设置计算
- 点击节点Solver,面板中设置Simulation Duration为6 s,设置Output Frequency为0.01 s
![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578260925095227.png?imageView2/0)
- 切换至General标签页,设置采用CPU并行计算,并设置CPU数量,点击Start按钮开始计算
![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578261004084327.png?imageView2/0)
![](https://image.ipaiban.com/upload-ueditor-image-20190812-1565578261102073837.gif?imageView2/0)