CST MWS staircase mesh的問(wèn)題
用CST仿真螺旋天線時(shí)經(jīng)常會(huì)出現(xiàn)“XXX mesh cells are represented in staircase mode and have been filled with PEC”的warning，有什么好的辦法可以解決這個(gè)問(wèn)題呢？如果直接網(wǎng)格加密，就會(huì)使得總的網(wǎng)格數(shù)目過(guò)大。
還有一個(gè)問(wèn)題就是mesh type 中的staircase是什么意思呢？看幫助文件也沒(méi)有看太懂。當(dāng)我把mesh type 改為staircase后仿真時(shí)出現(xiàn)Line impedance adaptation is deactivated for staircase mesh的warning，哪位達(dá)人能解釋一下呢？
如果沒(méi)有短路的話就不是大問(wèn)題，所以這個(gè)信息只是warning而不是error。
"xxx" mesh cells are represented in staircase mode and have been filled with PEC/PTC.
"yyy" mesh faces are represented in staircase mode and have been filled with PEC/PTC.
Depending on the chosen hexahedral solver this warning might appear. It means that within a mesh cell or a mesh face a certain geometrical configuration cannot be used to run the solver correctly. Therefore these cells or cell faces are filled with PEC or PTC depending on the chosen problem type. However, in many cases these filled cells do not influence the simulation results significantly. The staircase based cells can be seen in the mesh view.
Solution:
Please make sure that the mesh is not too coarse at locations where the staircase based cells appear.
Depending on the chosen problem type, please activate the "Use TST cells" checkbox if provided in the "Mesh Properties - Hexahderal->Specials...->Advanced" dialog box.
CST MWS幫助文件《Mesh Problem Handling》。
關(guān)于第二個(gè)問(wèn)題，不知道你看的是哪個(gè)幫助文件，是《Staircase Mesh》這個(gè)嗎？Stairecase mesh通常用于表面結(jié)構(gòu)（surface structure）或者導(dǎo)入但無(wú)法修復(fù)（imported shape that cannot be healed）的模型。
如果模型設(shè)置了波導(dǎo)端口，默認(rèn)情況下，瞬態(tài)求解器會(huì)在仿真之前在端口區(qū)域使用網(wǎng)格優(yōu)化計(jì)算準(zhǔn)確的line impedance和場(chǎng)模式，但此功能不支持staircase mesh。
CST MWS幫助文件《Special Solver Parameters - Waveguide》。
Line impedance adaptation before solver run: Activates the adaptive port meshing feature to automatically calculate a more accurate line impedance and mode pattern. For this purpose the port mode solver runs several passes while adaptively refining the port mesh.
Accuracy: Represents an accuracy limit for the relative error of the line impedance. The adaptive port meshing is finished when the line impedance has not changed more than this value for two following passes or the maximum number of passes is reached.
Max. number of passes: Restricts the number of passes in the adaptive port meshing if the port line impedance takes too long to converge.
