利用CFX计算通电线圈产生的焦耳热以及共轭散热
本案例演示利用CFX计算通电线圈产生的焦耳热以及共轭散热。
注:本案例来自CFX Tutorials文档。这文档是个好东西,有空多撸几遍,软件操作基本问题不大了。
1 问题描述
计算区域中同时包含流体区域以及固体区域。其中流体为环形区域,内部介质为液态水,初始温度300 K,流速0.4 m/s。铜线圈具有4.4 v的电势差,初始温度550 k。假设铜线圈具有均匀的电导率59.6e6 S/m,且其表面沉积了1 mm的碳酸钙。材料属性 | 参数值 | 单位 |
---|
Molar Mass | 100.087 | kg kmol^-1 |
Density | 2.71 | g cm^-3 |
Specific Heat Capacity | 0.9 | J g^-1 K^-1 |
Thermal Conductivity | 3.85 | W m^-1 K^-1 |
2 CFX设置
- 启动CFX,如下图所示设置Work Directory,点击按钮CFX-Pre启动CFX
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071213339_bg743v.jpg?imageView2/0)
- 点击工具栏按钮New Case打开设置对话框,选择General项,点击按钮OK新建Case
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071218504_7sr0tc.jpg?imageView2/0)
2.1 导入计算网格
- 选择菜单Edit → Options…打开设置对话框
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071216557_zag9mi.jpg?imageView2/0)
- 选择菜单File → Import → Mesh…打开文件选择对话框
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071217037_5k6qs9.jpg?imageView2/0)
- 如下图所示选择网格文件EX06.cas,点击OK按钮导入网格文件
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071219653_lxtsxg.jpg?imageView2/0)
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071217476_jjon0i.jpg?imageView2/0)
2.2 材料编辑
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071219376_8hzkdu.jpg?imageView2/0)
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071214064_62sa6k.jpg?imageView2/0)
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071213650_hv0372.jpg?imageView2/0)
- 修改Thermodynamic State为Solid
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071215814_l2lb96.jpg?imageView2/0)
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071213049_hg9xga.jpg?imageView2/0)
2.3 计算区域设置
- 如下图所示删除默认区域Default Domain
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071216259_hf89u4.jpg?imageView2/0)
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071215092_vgj7u5.jpg?imageView2/0)
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071214645_928enn.jpg?imageView2/0)
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071215385_2vthrb.jpg?imageView2/0)
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071217904_juoe5n.jpg?imageView2/0)
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071216715_pl26o8.jpg?imageView2/0)
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071213494_abquin.jpg?imageView2/0)
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071215966_pbuonj.jpg?imageView2/0)
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071216108_6n86qr.jpg?imageView2/0)
2.4 边界条件设置
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071217330_2zqasr.jpg?imageView2/0)
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071215535_yusmmf.jpg?imageView2/0)
- 在Basic Settings标签页中指定边界位置为Coil End 1
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071214218_6db5aa.jpg?imageView2/0)
- 进入Boundary Details,指定Electric Field为Voltage,指定Voltage为0 V
- 相同方式创建另一个边界hot,指定边界位置为Coil End 2
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071217630_td3qb3.jpg?imageView2/0)
- 进入Boundary Details,指定Electric Field为Voltage,指定Voltage为0 V,指定电压为4.4 V,如下图所示
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071215237_4tb5mj.jpg?imageView2/0)
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071218073_oe4zf8.jpg?imageView2/0)
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071218918_ljc840.jpg?imageView2/0)
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071212903_s2w22v.jpg?imageView2/0)
- 指定入口速度为0.4 m/s,指定温度300 K,如下图所示
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071219068_jp5aid.jpg?imageView2/0)
- 创建出口边界,指定其类型为Opening,指定其位置为outflow
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071216895_8li8v0.jpg?imageView2/0)
- 如下图所示指定static Temperature为areaAve(T)@REGION:outflow
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071219222_0gqj5d.jpg?imageView2/0)
2.5 创建交界面
- 双击模型树节点Default Fluid Solid Interface
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071213787_icb3ih.jpg?imageView2/0)
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071213925_rckmhy.jpg?imageView2/0)
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071218215_1znvdq.jpg?imageView2/0)
注:这里可以设置接触热阻,也可以指定薄壁层让软件自己计算接触热阻。
2.6 设置求解控制参数
- 鼠标双击模型树节点Solver Control弹出参数设置面板
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071213195_xwylx9.jpg?imageView2/0)
- 指定最小迭代次数1,最大迭代次数为300,如下图所示
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071217180_z5cf7k.jpg?imageView2/0)
2.7 求解计算
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071214777_luzoan.jpg?imageView2/0)
2.8 求解计算
- 如下图所示设置并行计算参数,指定CPU数量,点击按钮Start Run开始求解计算
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071215666_j83lbp.jpg?imageView2/0)
- 计算完毕后如下图所示,选中选项Post-Process Results,点击OK按钮打开CFD-Post进行后处理
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071214360_pwp0wb.jpg?imageView2/0)
3 计算结果
3.1 温度分布
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071217762_b0r0ag.jpg?imageView2/0)
3.2 查看圆柱面上温度分布
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071214944_jg2d7s.jpg?imageView2/0)
- 创建变量radius,指定其表达式为expradius,如下图所示
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071216410_ehkju4.jpg?imageView2/0)
- 创建等值面,指定变量radius的值为0.8,如下图所示
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071219512_mmt4so.jpg?imageView2/0)
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071212762_eky6bu.jpg?imageView2/0)
3.3 查看温度沿线分布
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071218786_rsqzic.jpg?imageView2/0)
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1577071218355_2210ig.jpg?imageView2/0)
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