Transcription of CFDの解法選択 - gijyutsu-keisan.com
1 CFD .. + = 0 .. + = + . = , , .. + = + .. = 1 = = .. + = + .. CFD . = .. CFD computational fluid dynamics = .. Mesh t .. t .. + = + .. + .. CFD . CFD .. CFD .. 1 FDM Finite Difference Method .. 2 FVM Finite Volume Method . CV Control Volume CV . CFD . 3 FVM Finite Element Method .. CAE . 1 2 3 .. 1 Explicit Method . t t + t . 2 Implicit Method . t+ t .. 1 .. STEP STEP.. 1 2 .. t .. 1 .. 2 .. + .. M = v / c .. 2 = .. = 0 + =0.. d 0 .. 1 2 . = = = .. 2 .. = .. 1. 1 1 2 = 5% . 2.. 2 =.. d 0 d 0 . c = c < . v c .. d 0 .. + = 0.. + = + . = , , .. v P .. v P .. + = 0.. + = + . = , , .. + = + .. , , = 0 3 .. 3 3 .. 1 2 3 . START START START.. No No No .. Yes Yes Yes END END END.. v p vpred ppred vcorr pcorr . 0 . = + .. = + . 4 . - . SIMPLE Semi-Implicit Method for Pressure-Linked Equation SIMPLE C SIMPLE Consistent SIMPLE R SIMPLE Revise PISO Pressure-Implicit with Splitting of Operators.
2 4 - CPU . SIMPLE SIMPLE R SIMPLE C PISO. SIMPLE .. / .. 1 SIMPLE R SIMPLE C . SIMPLE R Mesh SIMPLE C . 2 .. - . 1 SIMPLE /SIMPLE C 2 SIMPLE R 3 PISO. START START START. v p v p v p . vpred vmid SIMPLE Loop . vpred pcorr vcorr v p . pcorr p . pcorr .. vcorr pcorr . vcorr . v p vcorr . v p . No v .. No . Yes . No Yes END END. Yes END.. - . 1 SIMPLE .. = = .. 2 SIMPLE C . SIMPLE SIMPLE .. 3 SIMPLE R .. SIMPLE .. 4 PISO .. SIMPLE .. 1. 2 , ( ), ( ). 2. : . 3. CAE ( 21 ).