為了了解槽壁效應對於潛體模型總阻力之作用規律，本研究參考日本長崎大學之槽壁效應研究，分析在試驗水槽之阻力實驗，將在小水槽與在大水槽之阻力差值視為受槽壁效應所致的阻力增加量，並比較不同速度下大小兩水槽之阻力差異並以理論推導出槽壁校正後之阻力值。
本研究選用DARPA(Defense Advanced Research Projects Agency)所公開發表之潛軆Suboff model 5470之裸船潛體模型為研究對象，以商用計算流體力學軟體ANSYS FLUENT進行數值模擬，先與美國David Taylor船模試驗水槽的實驗結果進行比對，以驗證計算結果的可信度。接著，等比例縮放數個潛體模型以進行模擬以求得潛體模型總阻力，同時，也計算該潛體相同速度下無窮領域之阻力。計算前亦進行網格獨立性的分析，以確定所使用的網格數量為適當，並計算相對於無窮領域時之阻力增加量以探討在不同相對面積比與福祿數(Froude Number)下，槽壁效應對潛體模型阻力之影響，而潛體之潛航深度亦納入考慮下，再進行相同分析。結果發現在相同速度下，在潛體尺寸較小時，受試驗水槽槽底之影響較大，故潛航深度較大之潛體，其模型總阻力較大；潛體尺寸較大時，受試驗水槽之自由液面影響較大，故潛航深度較小之潛體，其模型總阻力較大。
最後，本研究將大量數據無因次化後，以相對面積比、福祿數、潛航深度比為自變數，使用統計軟體SPSS進行線性複迴歸分析，求得阻力校正係數之公式，認為考量潛航深度之三變數迴歸公式較合理，能在NCKUTT提供槽壁效應對於潛體阻力之良好校正，以期未來能作為其潛體實驗之阻力校正的參考指標。

The main purpose of this research is to develop a blockage correction formula for submerged body by CFD method. The final objective is to establish the comprehen-sive blockage correction formulas of various submerged bodies for the NCKU tow-ing tank with respect to the section ratio, bottom clearance, submerged depth and model speed.
Blockage Effect is widely known in the field of naval architecture. It is quite common and robust to execute model test in a towing tank to acquire ship performance in model scale and then theoretically transformed to that in full scale. However, the ship in the restricted tank performs somewhat differently from that in the open sea areas due to the confinement to flow near the ship, and the phenomenon for the submerged body is similar.
To realize the principle of the blockage effect of submerged body in the towing tank, the present study carried out the related numerical simulations for the SUBOFF Model 5470(Bare Hull) by ANSYS FLUENT. Conditions such as section ratio of the model ship to tank, model speed, bottom clearance, and submerged depth were taken into consideration. In the end, two correction formulas was proposed to make block-age corrections for the NCKUTT experiments.
According to the results in this research, the fact that resistance test data of the SUBOFF model in NCKUTT do need corrected was ensured, particularly in high speed range. The larger the submerged body, the more the blockage corrected incre-ment. In contrast, it shows no consistency for velocity effect among different sub-merged bodies. Generally, the free surface effect contributes the resistance increment to submerged body more than the bottom effect.

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