本人正在做气囊着陆问题求解，需要考虑空气阻力和风速的影响。 我想请问一下如何给空气施加风速，是否跟固体施加速度一样，用INITIAL_VELOCITY就好了？ 还有如若不考虑风速影响的话，一般地面上的跌落问题是不是就不用考虑空气的影响？

<p style="font-family:宋体, SimSun;font-size:14px;margin-top: 0px; margin-bottom: 15px; padding: 0px; text-align: justify;Lantinghei SC", "Open Sans", Arial, "Hiragino Sans GB", "Microsoft YaHei", STHeiti, "WenQuanYi Micro Hei", SimSun, sans-serif; white-space: normal; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255); max-width: 850px !important; line-height: 25px !important; position: inherit !important;"> <p style="font-family:宋体, SimSun;font-size:14px;margin-top: 0px; margin-bottom: 15px; padding: 0px; text-align: justify;Lantinghei SC", "Open Sans", Arial, "Hiragino Sans GB", "Microsoft YaHei", STHeiti, "WenQuanYi Micro Hei", SimSun, sans-serif; white-space: normal; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255); max-width: 850px !important; line-height: 25px !important; position: inherit !important;">我想请问一下如何给空气施加风速，是否跟固体施加速度一样，用INITIAL_VELOCITY就好了？<p style="font-family:宋体, SimSun;font-size:14px;margin-top: 0px; margin-bottom: 15px; padding: 0px; text-align: justify;Lantinghei SC", "Open Sans", Arial, "Hiragino Sans GB", "Microsoft YaHei", STHeiti, "WenQuanYi Micro Hei", SimSun, sans-serif; white-space: normal; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255); max-width: 850px !important; line-height: 25px !important; position: inherit !important;">reply:不可以，要定义进出口的压力或者流速，模拟空气的流动<p style="font-family:宋体, SimSun;font-size:14px;margin-top: 0px; margin-bottom: 15px; padding: 0px; text-align: justify;Lantinghei SC", "Open Sans", Arial, "Hiragino Sans GB", "Microsoft YaHei", STHeiti, "WenQuanYi Micro Hei", SimSun, sans-serif; white-space: normal; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255); max-width: 850px !important; line-height: 25px !important; position: inherit !important;">还有如若不考虑风速影响的话，一般地面上的跌落问题是不是就不用考虑空气的影响？<p style="font-family:宋体, SimSun;font-size:14px;margin-top: 0px; margin-bottom: 15px; padding: 0px; text-align: justify;Lantinghei SC", "Open Sans", Arial, "Hiragino Sans GB", "Microsoft YaHei", STHeiti, "WenQuanYi Micro Hei", SimSun, sans-serif; white-space: normal; color: rgb(68, 68, 68); background-color: rgb(255, 255, 255); max-width: 850px !important; line-height: 25px !important; position: inherit !important;">reply: 水平方向和垂直方向都应该有空气的阻力，即使水平方向风速为零，但是垂直方向依然有空气阻力