搜索如何設(shè)置PML邊界條件？怎么解決Error:The material of the PML base object cannot be anisotropic？
2016-11-14 by:CAE仿真在線 來源:仿真在線
2-line-antenna (L:/hfss/華為團(tuán)體培訓(xùn)/ansoft-hfss-caoshanyong/Ch 02/)HFSSDesign1 (DrivenModal)
[warning] HFSSDesign1: Solutions have been invalidated. Undo to recover. (4:49:11 下午 十一月 14, 2015)
[info] Solution Setup 'Setup1', Sweep 'Sweep': Interpolating sweep converged. (4:53:29 下午 十一月 14, 2015)
[info] Normal completion of simulation on server: Local Machine. (4:53:29 下午 十一月 14, 2015)
[warning] HFSSDesign1: Solutions have been invalidated. Undo to recover. (4:58:10 下午 十一月 14, 2015)
[warning] Adaptive Passes did not converge based on specified criteria. (4:58:23 下午 十一月 14, 2015)
[info] Solution Setup 'Setup1', Sweep 'Sweep': Interpolating sweep converged. (4:58:44 下午 十一月 14, 2015)
[info] Normal completion of simulation on server: Local Machine. (4:58:45 下午 十一月 14, 2015)
[warning] HFSSDesign1: Solutions have been invalidated. Undo to recover. (5:00:48 下午 十一月 14, 2015)
[error] An object that is assigned the zero-conductivity material 'vacuum' must have 'Solve Inside' enabled. (5:02:27 下午 十一月 14, 2015)
[warning] HFSSDesign1: Solutions have been invalidated. Undo to recover. (5:17:09 下午 十一月 14, 2015)
[warning] HFSSDesign1: Solutions have been invalidated. Undo to recover. (5:17:45 下午 十一月 14, 2015)
[warning] Boundary 'Rad1': Boundary lost its assignment due to geometry modifications and has been deleted. (5:24:44 下午 十一月 14, 2015)
[warning] Warning - Boundary 'PerfE1' and Boundary 'PML_radiation1' overlap. (6:31:25 下午 十一月 14, 2015)
[warning] Warning - Boundary 'PerfE1' and Boundary 'PML_radiation2' overlap. (6:31:25 下午 十一月 14, 2015)
[error] %1 '%2':: The material of the PML base object cannot be anisotropic. (6:31:25 下午 十一月 14, 2015)
[warning] PML group 'PMLGroup1' part 'PML_Box1_1' is contained by object 'Box2' (6:31:25 下午 十一月 14, 2015)
[warning] PML Setup: PML Material parameters are out of sync with the problem setup and need to be recalculated using the PML Setup Wizard. (6:31:25 下午 十一月 14, 2015)
上面提示存在2個(gè)問題
1、An object that is assigned the zero-conductivity material 'vacuum' must have 'Solve Inside' enabled
這個(gè)表示真空材料,你不能修改對象屬性里面的Solve Inside為disable,即不打勾 真空材料必須solve inside,否則出錯(cuò)。
既然是真空了,難道還有表面之分嗎?
2、The material of the PML base object cannot be anisotropic
翻譯:基于PML的材料對象,不能是各相異性的。
出現(xiàn)這個(gè)問題,是把帶有各向異性的3d對象設(shè)置成了PML對象,這樣是不行的,PML對象一般是真空或各向同性材料對象
問題的根本學(xué)員對PML設(shè)置流程不了解。
PML要么設(shè)置在面上(hfss會自動(dòng)根據(jù)所選擇的面,創(chuàng)建PML層對象),要么設(shè)置在體上,而設(shè)置在體上表示那些小方塊都由你自己去創(chuàng)建,而不是hfss自動(dòng)創(chuàng)建。
創(chuàng)建PML邊界的正確做法步驟:
1、先做一個(gè)空氣盒子,這個(gè)空氣盒子離模型應(yīng)該大于lambda/20,(比輻射邊界的1/4要小多了,但是你別高興的太早了)
2、然后選擇這個(gè)空氣盒子的6個(gè)面(記得,是面face不是object哦)
3、然后asign boundary-》pml setup wizard
然后進(jìn)行如圖設(shè)置,數(shù)據(jù)一般用默認(rèn)的就行了,他會根據(jù)你設(shè)置的頻率范圍進(jìn)行合理計(jì)算(一般邊界層寬度要大于1/3波長,這里你是不是嚇倒了?比1/4波長更長誒)。
圖:PML自動(dòng)創(chuàng)建一定是要選第一個(gè)選項(xiàng)
圖:PML設(shè)置完畢后正常情況下會產(chǎn)生這些自動(dòng)生成的方塊,他們會包圍住整個(gè)模型
圖:自動(dòng)生成的PML層默認(rèn)是隱藏的,你要自己把他顯示出來,才可以看到上圖的效果。
整個(gè)設(shè)置下來,到了最后會生成數(shù)十個(gè)小box,而且總體體積(網(wǎng)格數(shù)量)遠(yuǎn)大于radiation時(shí)使用的空氣盒子,其實(shí)計(jì)算空間更大了
這就是為啥PML消耗內(nèi)存和計(jì)算時(shí)間的原因。
但是他的優(yōu)點(diǎn)是邊界完全吸收,不反射。這就是問題的重點(diǎn)。
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