跟讀練習: Transient Thermal Analysis in ANSYS AIM - 通過影片學習英語口語
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94 句
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Hello and welcome to this demonstration of ANSYS AIM.
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Today we will be performing a transient thermal analysis of a frying pan that is heated on a stove with natural convection.
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The heat flow into the pan will be 250 watts,
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with a convection coefficient of 20 watts per meter squared degrees Celsius which will act as the natural convection of the pan.
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We want to find out is the time it takes for the max temperature to reach 100 degrees Celsius
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and approximately when steady state is reached.
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With AIM pulled up, we will now begin our analysis.
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We will do a transient thermal analysis and to do this, We will select the simulation process template, thermal.
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AIM will now start creating the template To do so, we first will need to import existing geometry.
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We'll uncheck the allow model editing because we won't need that.
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And then since we're doing a transient analysis, we want to do a time -dependent calculation type.
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Since there is only one part to our analysis, we will turn off detect contact automatically as well.
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With all these options selected, we are now ready to create the simulation process.
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AIM is now asking us to select the geometry.
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We'll select the geometry up here, frying pan, and then select open.
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Now that we have our geometry imported, we'll want to select our unit system.
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I'll go up into the Project menu, go down to Units, and select the metric system.
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Next, we will go to meshing.
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I'll go ahead and click on "Mesh" in the simulation process data panel.
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we can use predefined settings But let's go down into the global sizing.
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I'm going to set it to curvature which will help with meshing for circular geometry.
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For instance, these fillet radii on my frying pan.
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I'll now go ahead and push the blue lightning bolt, which will update and start generating my mesh.
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Now that the mesh is finished, you can see that Along those curvatures, the mesh is more refined.
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This is to better capture that geometry.
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Thank you.
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Next, we will want to set up our boundary conditions or thermal conditions for our analysis.
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we'll go down to the View panel and click on the Physics tab.
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Thank you.
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From here, We can go up into the Physics Data panel And set our Analysis settings.
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We are performing a time -dependent analysis, which means a transient thermal analysis, For duration, I'll go ahead and type in about 30 minutes.
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That should give us plenty of time to see when steady state will occur.
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That's 1800 seconds.
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Thank you.
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Our physics region is our pan, which is already being defined, Now we will need to define our material assignments.
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I'll click on material assignments.
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And currently it's set to structural steel.
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I actually want to set it to cast iron.
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I can either type in cast iron or I can go find it in the list here.
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I'll select cast iron.
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and that will apply that material property to my frying pan.
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If I want to see or check on the material properties, I can click on this drop down arrow next to the cast iron.
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This is where I will verify my material properties.
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I'll next want to go back to the Physics tab.
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and continue down the list of items that I need.
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Next, I'll be adding my thermal boundary conditions.
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So I can click on this Add button.
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and what we want first is heat flow.
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So I'll select that.
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The HEATFO data panel Pull up.
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and it'll ask me to define a location.
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I can go and click in the box, Then since the stove top will be underneath my pan, I can select the bottom there.
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To confirm this selection, I'll hit the plus sign next to the location.
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I'll next need to define the magnitude of the heat flow.
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This will be 250 watts.
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I also want to apply convection to my model.
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so I can click "Next Step" Add.
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I go to solid thermal conditions.
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and then I'll select Convection.
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Thank you.
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So I want to basically apply my convection to everywhere else in the model except for where I applied the heat flow.
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So to do this, I can right -click, and then use the Select All feature.
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I don't want all the faces to be selected.
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So I'll go ahead and deselect the face where the heat flow is applied.
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To confirm the selection, again I'll go back up to the plus sign, and add the selected entities.
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Thank you.
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heat transfer coefficient that all apply is 20 watts per meter squared degrees Celsius.
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and then the convection temperature which is basically your environment temperature, I'll just set at room temperature, which is 22 degrees Celsius.
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I can then go back to my Physics tab, and everything else I'll leave as default.
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I'm now ready.
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to solve my analysis.
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To solve, I can right -click on this Physics tab, and select update.
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Now that the solution is done solving, I can go to my Results section.
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I'll click on the results tab.
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In the Results tab, You'll notice that there are already predefined results.
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by clicking the drop -down arrow next to the results in the data panel, I'll see that there's a contour plot here.
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This is the contour of a temperature plot.
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I can go ahead and click on that.
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and you'll notice that it says that it's out of date.
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What I want to do next is just click the lightning bolt to evaluate these results.
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I can now take a look at my contour plots.
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You can see that the maximum temperature is slightly above 150 degrees Celsius.
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One of the objects that we had in the analysis was to determine about what time
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the temperature reached above 100 degrees Celsius.
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we can click the right arrow besides the calculated maximum and choose to plot this.
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I'll go over to the chart and expand it so that it has a full window view.
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So now we can find at what point The temperature reached 100 degrees Celsius.
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We'll go over to 100 degrees Celsius and follow that datum all the way to where it crosses our curve.
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This is at about 300 seconds.
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We can also determine when our analysis reaches steady state by looking at when our temperature plot flattens out.
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This is at about 1500 seconds.
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This concludes...
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The ANSYS -AIM transient thermal analysis.
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Thank you. and goodbye.
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本課的詞彙與口語要點
這節 C1 級別的口語課以影片“Transient Thermal Analysis in ANSYS AIM”為素材。 影片中反覆出現的詞有：click, analysis, select, temperature, Celsius。 這段影片共有 94 個句子、1078 個單詞可供跟讀。 講話部分時長為 8:48。 說話人語速平穩，每分鐘約 123 個詞，很適合跟讀。 只有 79% 的單詞屬於英語最常用的 3,000 詞，詞彙難度較高。
影片中的重點詞彙
影片中最難的 15 個單詞，附發音和釋義：
| 單詞 | 發音 | 釋義 |
|---|---|---|
| convection 名詞 | /kənˈvɛkʃən/ | 對流 /對流 |
| mesh 名詞 | /mɛʃ/ | 網孔 /網孔 |
| geometry 名詞 | /d͡ʒiˈɑ.mə.tɹi/ | 幾何 /幾何, 幾何學 /幾何學 |
| transient 形容詞 | /ˈtɹæn.ʃənt/ | 短暫的 /短暫的 |
| watt 名詞 | /wɑt/ | 瓦特 |
| fry 動詞 | /fɹaɪ/ | 煎, 炒 |
| contour 名詞 | /ˈkɒntɔː/ | 輪廓 /輪廓 |
| simulation 名詞 | /ˌsɪm.jəˈleɪ.ʃn̩/ | 模擬 /模擬 |
| coefficient 名詞 | /ˌkoʊ.ɪˈfɪʃənt/ | 係數 /係數 |
| curvature 名詞 | /ˈkɜɹ.və.tʃəɹ/ | 曲率 |
| predefine 動詞 | 預定義 /預定義 | |
| template 名詞 | /ˈtɛm.plɪt/ | 模板, 型板 |
| stove 名詞 | /stoʊv/ | 火爐 /火爐, 爐 /爐 |
| metre 名詞 | /ˈmiːtəɹ/ | 米, 公尺 |
| bolt 名詞 | /boʊlt/ | 螺栓 |
影片中出現的短語動詞
| 單詞 | 發音 | 釋義 |
|---|---|---|
| go ahead 動詞 | /ˌɡoʊ əˈhɛd/ | 請便 /請便 |
| find out 動詞 | 找出, 查明 | |
| turn off 動詞 | 關 /關, 關掉 /關掉 |
值得反覆跟讀的句子
影片中簡短而完整的句子，可以直接用在日常對話裡：
- Next, I'll be adding my thermal boundary conditions.
- I don't want all the faces to be selected.
- I'll click on the results tab.
影片中的語法
說話人最常用的結構，並附上影片中的原話：
| 結構 | 影片中的用法 |
|---|---|
| 定語從句 who / which + 從句 — 補充說明人或事物 | Celsius which will · curvature which will · bolt, which will |
| 被動語態 be + 過去分詞 — 強調發生了什麼，而不是誰做的 | is heated · is reached · being defined |
需要注意的發音
說話人用了 32 次縮略和弱讀形式，例如 I'll, we'll, I'm。請按聽到的簡短形式來說。
- “th” 音: thermal /ˈθɜːməl/, underneath /ˌʌndɚˈniθ/
- “sh” 和 “zh” 音: convection /kənˈvɛkʃən/, mesh /mɛʃ/, transient /ˈtɹæn.ʃənt/, simulation /ˌsɪm.jəˈleɪ.ʃn̩/, coefficient /ˌkoʊ.ɪˈfɪʃənt/
- 長單詞——注意重音位置: geometry /d͡ʒiˈɑ.mə.tɹi/, coefficient /ˌkoʊ.ɪˈfɪʃənt/, demonstration /dɛmənˈstɹeɪʃən/
中文母語者容易讀錯的音：
- /v/ — 不要讀成 /w/，上齒輕觸下唇: convection /kənˈvɛkʃən/, curvature /ˈkɜɹ.və.tʃəɹ/, stove /stoʊv/, verify /ˈvɛɹɪfaɪ/, evaluate /ɪˈvaljʊeɪt/
- 詞尾子音 — 要讀清楚，後面不要加母音: mesh /mɛʃ/, transient /ˈtɹæn.ʃənt/, watt /wɑt/, coefficient /ˌkoʊ.ɪˈfɪʃənt/, template /ˈtɛm.plɪt/
- /æ/ — 嘴張大，不要讀成 /e/: transient /ˈtɹæn.ʃənt/, flatten /ˈflæ.tən/, calculation /ˌkælkjuˈleɪʃn̩/, calculate /ˈkælkjʊleɪt/, magnitude /ˈmæɡnɪtjuːd/
如何用這段影片練習
- 先完整聽一遍影片，不要開口，記下不認識的單詞。
- 用正常速度逐句跟讀，每句重複到你的節奏與說話人一致為止。
- 錄下自己的聲音並與原聲對比，特別注意 convection, mesh, geometry 這類單詞。
什麼是跟讀法？
跟讀法 (Shadowing) 是一種有科學依據的語言學習技巧，最初開發用於專業口譯員的培訓，並由多語言者Alexander Arguelles博士普及。這個方法簡單而強大：您在聽英語母語原聲的同時立即大聲重複——就像是一個延遲1-2秒緊跟說話者的影子。與被動聽力或語法練習不同，跟讀法強迫您的大腦和口腔肌肉同時處理並模模擬實的講話模式。研究表明它能顯著提高發音準確性，語調，節奏，連讀，聽力理解和口語流利度——使其成為雅思口語備考和真實英語交流最有效的方法之一。