CFX的一大缺陷是它本身不具有fluent那樣的網(wǎng)格重構功能,網(wǎng)格只能簡單的進行拉伸和壓縮,這樣在做大變形問題時,拉伸和壓縮后的網(wǎng)格質(zhì)量很難滿足我們的需求。
CFX為我們提供了兩種網(wǎng)格重構的功能,ICEMCFD remeshing和user defined remeshing。![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/c8/c8b9ddd2148c90b13355f8aa3f7115ccr.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
通過ICEM來進行remeshing已經(jīng)被大家熟悉,很多帖子都討論過。但是我們翻閱CFX的help可以發(fā)現(xiàn)下面這段話,這種對幾何模型的調(diào)整只有3個自由度:xyz三個坐標系下的平移量。![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/3a/3ac84367b08bdd0a1e04184c929190cfr.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
如果實際的問題中模型還具有旋轉運動呢?如下面這個問題:
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/85/85b1c1f2be7201362a3c58a826032d20r.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/b3/b3c8b0c95b09ff07f13d2baa05ac62a1r.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
內(nèi)部的方塊以1轉/s的角速度繞其中心旋轉,外圓處的壁面是靜止的?；凭W(wǎng)格可以處理這個問題,但如此簡單的問題remesh都做不了,實際中的問題會比這復雜很多,那么我們又應該怎么辦呢?user defined remeshing為我們提供了一條出路。
這里為大家提供一種user defined remeshing的方法,通過workbench進行remesh。首先我們要明白remesh的過程,在計算中我們會設定一個參數(shù)用來監(jiān)測網(wǎng)格的質(zhì)量,當網(wǎng)格質(zhì)量低于我們的設定值時,cfx會暫停計算,產(chǎn)生新的幾何文件,進行網(wǎng)格劃分,讀取新的網(wǎng)格,導入CCL以及將oldmesh的計算結果作為newmesh的初始條件,繼續(xù)計算。remeshing的主要功能即是完成圖中方框處的過程。
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/c6/c613b75d3f1b8bd80d744f67cff36eaer.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
我們將會通過workbench來完成網(wǎng)格的重構。具體問題如下:方塊繞其中心以1r/s的速度旋轉,同時其中心對X軸以1s的周期做0.2*sin(2*pi*t/1[s])和對Y軸以0.5s的周期做0.1*sin(4*pi*t/1[s])的正弦平移運動。
CFX細節(jié):
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/6e/6ea9ebc88df265db1aff2d1f21bfed92r.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/9e/9ed1791dee11baedde225642317bde2ar.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/a7/a7b9188b962285b27c850295ca693297r.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/4d/4d78a1546c2991138127d94e6be7befer.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/d4/d467112dca866438dbddeb69ddefe02cr.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/e9/e95228759869ca5aba3e02c0ae901b56r.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
從上面的圖可以看出,我們將會在CFX暫停后,以批處理命令打開workbench,讀取workbench的scripting文件進行網(wǎng)格的重新生成。計算初始的幾何文件預先存放在workbench中,同時預先定義了網(wǎng)格劃分的詳細細節(jié),當CFX計算停止后,我們會從其res文件中讀取當前幾何模型相對初始幾何模型的XY軸方向位移和相對其中心旋轉的角度值,將這3個值賦給workbench的幾何參數(shù)化對應的值,重新產(chǎn)生新的幾何,updata mesh。
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/ba/ba90ec201c4ce08db845a7c8b8bf16d5r.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
計算結果:
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/7d/7dcd0da2057c6bb7eb54145afc35f745r.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/36/36c85d7b6d53f499a644a8691b7fb77fr.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/f1/f113f60c665176e158658b9690438ec0r.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/eb/eb3af2ee42eef1604e3a68b172a327a1r.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/a9/a95e50d5d31bb012b35f3d4a8ce6d386r.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/f4/f49c1b1dc7b14b5bf6f6c6b57d7f286er.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/97/971a1d6275ff2ee88ebdc6eb9ec7e298r.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/7f/7f205ac78d5118a91532158ea21fac83r.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/eb/ebc2f33effe697129a0b82c640c4ce30r.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/57/57f4b17918a4a10f4ee04cde3a15c892r.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/8e/8ebbb9e45ce4295fd8e98b44ca3256d6r.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/b9/b9f3c68abffc89b193c02f8adf69c713r.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/78/78d75cbc8a332a26a12c1a2882a994cbr.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/0c/0cb6c5b3d8881e49463198a513c9bf9br.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/12/12a0ba010ab0a701cddfd9126433dfeer.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/22/22a52235507ea4b862f195589f5ae243r.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/86/86103788a97e212e6d8e188b7efe5f7ar.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/52/528cf125e8f66d9d909a1e4f0479cfbar.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/34/3483ce519e19ab8faeeb5161e31e0734r.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/18/18b7b05ee8733413067864dcf7657b63r.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/f6/f68dc7500951e243da8c0e477766bc76r.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
![[轉載]CFX wbruser wbrdefined wbrremeshing](http://119xfc.cn/i/g/06/06aa8771d2359f3f1397479fd27dc516r.jpg "[轉載]CFX wbruser wbrdefined wbrremeshing")
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