Questions tagged [hydrodynamics]

For questions dealing with the motion of fluids and the forces acting on solid bodies immersed in fluids and in motion relative to them.

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How would hydrostatic skeletons respond to different atmospheric pressures?

I'm wondering whether atmospheric pressure (high or low) would have any impact on the favorability of hydrostatic skeletons. Obviously hydrostatic skeletons work well in water, but I'm not sure if a ...
Elhammo's user avatar
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3 votes
2 answers
101 views

Melusine/Two-tailed Merfolk’s Dual Mobility, Land and Sea

Most people know about the famous Starbuck’s mermaid and her bizarre two tails. Starbuck's Logo However, few know that her origins actually harken back to very old depictions of mermaids that can be ...
Thunderhammer's user avatar
0 votes
2 answers
123 views

Which limbs should be retained or lost to turn this land animal into a swimmer? [closed]

The form of large swimming animals is fairly consistent across distantly related groups. As example, all aquatic mammals, save the quadrupedal semiaquatic forms, have adapted for a fish-like shape ...
Ichthys King's user avatar
2 votes
1 answer
128 views

Could a fish lie horizontally with an air-space in its head?

The polyp-fish is a soft-bodied sea-creature about a foot long. It has in its head an organ that forms an inflated air-space filled with gas, which makes the head appear hard and round. The rest of ...
Ichthys King's user avatar
2 votes
2 answers
1k views

How quickly will the oceans freeze if Earth becomes a rogue planet?

Assume Earth has been wrenched out of the Sun's orbit and has become a rogue planet (for the purposes of this question, assume that it happens near instantaneously, i.e. say the Sun just vanishes). ...
ak7's user avatar
  • 473
2 votes
2 answers
165 views

What would a fish look like if it was adapted to live in honey?

The fish is around 50cm long, and moves through the honey by swimming. The honey is fresh from the bees that made it, and stays that way effectively forever. The fish is a carnivore, and eats ...
Ichthys King's user avatar
19 votes
8 answers
5k views

What would realistically happen if you could water walk?

I like to add fantastical things and make them mundane. In this case, instead of building and maintaining a pedestrian bridge in a fantasy world they would create a waterwalking path. In this case, ...
Demigan's user avatar
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2 votes
2 answers
921 views

What effect would water that is twice as dense, while still liquid, have if a human were to try and swim in it?

In my world there are two bodies of water. One acts as a radiation shield and is part of the atmosphere, so it needs some (undecided) force to keep it in place. The other is ideally twice as dense as ...
Aurora Weigert's user avatar
4 votes
7 answers
3k views

How to create a floating rock

How to create a floating rock? This question is inspired from the Indian Sanskrit epic Ramayana, in which Lord Ram builds a bridge Rama Setu connecting India and Sri Lanka, which was entirely made of ...
V.Aggarwal's user avatar
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0 votes
1 answer
93 views

Aerodynamics of propeller vs screw/fin based aerial propulsion

Would it make sense to use screw- and fin-like bending surfaces for propulsion (like what eels or the king of herrings have but in the atmosphere) instead of regular propellers or even flapping wings ...
user72590's user avatar
3 votes
2 answers
84 views

Diffusion and Organic Reactions in Mist

Basic scenario: An abundance of a simple Lipid is introduced to a large body of liquid (water for simplicity), there’s some motion; wind or gravity or whatever, and the Lipids bump into one another. ...
Darius Arcturus's user avatar
6 votes
2 answers
329 views

How to safely construct deep underground harbors on a Snowball Earth?

A radical shift in the Earth's orbit has made the Earth much colder, with all the oceans freezing over, and the atmosphere liquifying and falling as rain. Humans live deep underground in areas of high ...
ak7's user avatar
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5 votes
1 answer
132 views

Deities vs You /Liquid Anon/ What'd be the most optimal carrier fluid comopsition? [closed]

Liquid Anon is my little OC, a total badass, with the ability to assume any form and color at a whim. Donut steel! A magnetorheological fluid (MR fluid, or MRF) a type of smart fluid in a carrier ...
Mephistopheles's user avatar
22 votes
5 answers
5k views

How dense of an atmosphere do I need to "float" an ocean of liquid at 1000 ft elevation?

I recently watched a special on cave divers in the Yucatan Peninsula and part way through that show the divers encountered a feature called a Halocline, a meeting of two different water masses of ...
Josh Belmont's user avatar
  • 1,502
0 votes
2 answers
157 views

Meteor Impact Events and Magnetohydrodynamics

Siberia was formed as a result of a massive hotspot volcano (Siberian Traps) ~250 million years ago (mya) and so was India ~64 mya (Deccan Traps). So, I was working on a random planet generator for ...
punkerplunk's user avatar
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23 votes
1 answer
1k views

Ship design that could navigate on the edge of an incredibly strong vortex

I'm developing a game set in a colossal landmass at the center of a vortex, with water walls dozens of kilometers high. The continent is somewhat circular, and no civilization has yet developed ...
Christian Fratta's user avatar