Confused of two panels of “vorticity”
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According to vorticity ($ vec{zeta}=nablatimesvec{V}$), flow can be defined as rotational or irrotational flow. I read the material about it in Page.3 (http://web.mit.edu/16.unified/www/FALL/fluids/Lectures/f11.pdf). The Figure.1 shows these two types.
However, I am a little puzzled. The left panel seems "do not rotate: its short edges are parallel to x-axis", the right panel seems "a little bit rotate: its short edges are not parallel to x-axis". Moreover, I do not understand the meaning of thin dot lines attached in elements in the lower part of right panel.
pde fluid-dynamics
asked Dec 12 '18 at 13:23
T XT X
154
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$begingroup$
According to vorticity ($ vec{zeta}=nablatimesvec{V}$), flow can be defined as rotational or irrotational flow. I read the material about it in Page.3 (http://web.mit.edu/16.unified/www/FALL/fluids/Lectures/f11.pdf). The Figure.1 shows these two types.
However, I am a little puzzled. The left panel seems "do not rotate: its short edges are parallel to x-axis", the right panel seems "a little bit rotate: its short edges are not parallel to x-axis". Moreover, I do not understand the meaning of thin dot lines attached in elements in the lower part of right panel.
pde fluid-dynamics
asked Dec 12 '18 at 13:23
T XT X
154
$endgroup$
add a comment |
$begingroup$
According to vorticity ($ vec{zeta}=nablatimesvec{V}$), flow can be defined as rotational or irrotational flow. I read the material about it in Page.3 (http://web.mit.edu/16.unified/www/FALL/fluids/Lectures/f11.pdf). The Figure.1 shows these two types.
However, I am a little puzzled. The left panel seems "do not rotate: its short edges are parallel to x-axis", the right panel seems "a little bit rotate: its short edges are not parallel to x-axis". Moreover, I do not understand the meaning of thin dot lines attached in elements in the lower part of right panel.
pde fluid-dynamics
asked Dec 12 '18 at 13:23
T XT X
154
$endgroup$
According to vorticity ($ vec{zeta}=nablatimesvec{V}$), flow can be defined as rotational or irrotational flow. I read the material about it in Page.3 (http://web.mit.edu/16.unified/www/FALL/fluids/Lectures/f11.pdf). The Figure.1 shows these two types.
However, I am a little puzzled. The left panel seems "do not rotate: its short edges are parallel to x-axis", the right panel seems "a little bit rotate: its short edges are not parallel to x-axis". Moreover, I do not understand the meaning of thin dot lines attached in elements in the lower part of right panel.
pde fluid-dynamics
pde fluid-dynamics
asked Dec 12 '18 at 13:23
T XT X
154
asked Dec 12 '18 at 13:23
T XT X
154
asked Dec 12 '18 at 13:23
T XT X
154
asked Dec 12 '18 at 13:23
T XT X
154
asked Dec 12 '18 at 13:23
T XT X
154
154
add a comment |
add a comment |
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