短語詞組短語upwind implicit scheme 迎風隱格式upwind compact scheme 迎風緊致格式upwind leapfrog scheme 迎風蛙跳格式upwind differencing scheme upwind 格式upwind TVD scheme 迎風TVD格式upwind Osher scheme Osher 逆風格式upwind differential scheme 迎風差分格式central -upwind difference scheme 中心迎風格式 返回 upwind scheme