Áï, ±ØÁÂÇ¥·Î À¯µµÇÏ·Á°í Çϸé
x = rcos# , y = rsin# (#=°¢)
À¸·Î µÎ¾î¿© ÇÏÁÒ
±×·¯¸é
@u/@r = @u/@x¡¿@x/@r + @u/@y¡¿@y/@r = @u/@x¡¿cos# + @u/@y¡¿sin#
@u/@# = @u/@x¡¿@x/@# + @u/@y¡¿@t/@# = @u/@y¡¿(-rsin#) + @u/@y¡¿(rcos#)
ÀÌÁÒ, °°Àº ¹æ¹ýÀ¸·Î °è»êÇϸé
@v/@r = @v/@x¡¿cos# + @v/@y¡¿sin#
@v/@# = @v/@x¡¿(-rsin#) + @v/@y¡¿(rcos#)ÀÌÁÒ
ÀÌÁ¦ u¿ÍvÀÇ ÀÏÂ÷ÆíµµÇÔ¼ö½ÄÀÌ ÀÖÀ¸¹Ç·Î, ÄÚ½Ã-¸®¸¸ ¹æÁ¤½ÄÀ» ¾µ¼öÀÖ°ÚÁÒ
±×·¯¸é,
@v/@r =-@u/@y¡¿cos# + @u/@x¡¿sin#
@v/@# =-@u/@y¡¿(-rsin#) + @u/@x¡¿(rcos#)
ÀÌÁ¦ À§ÀÇ ½Ä°ú óÀ½°è»êÇÑ ½ÄÀ» µûÁ®º¸¸é
r¡¿@u/@r=@v/@# , @u/@#=-r@v/@r À̳ª¿À°í ÀÌ°ÍÀÌ ±ØÁÂÇ¥·Î Ç¥½ÃÇÑ
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