Questions tagged [fluid-simulation]

Questions about the Fluid simulation systems in blender. Blender has two systems for simulating liquids, a SPH (Smoothed Particle Dynamics) system integrated with the particle system, and a Lattice Boltzmann method which can be used create a variety of simulations.

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700 views

Converting an obj sequence to a .bobj fluid sim cache?

I'm wondering if there is any way to accomplish turning an obj sequence exported from realflow into a .bobj fluid cache that I could then trick blender into loading as a native fluid sim cache. So far ...
4
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179 views

How do I colour a fluid simulation in Cycles based on velocity?

I want to assign a gradient to the water simulations I have. I want to do this by the velocity in the current voxel, so the fastest moving areas will be red and the slowest blue. How would this be ...
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271 views

How to light liquid on fire?

I'm trying to simulate liquid being lit on fire, but only the fluid works when I simulate both domains (the fire domain is on the second layer). I tried to find a tutorial for this, but wasn't able ...
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456 views

How to create very realistic rain with a particle system surrounded by a fluid domain?

I am working on a scene for a short film in which it is raining on a desert. One of the shots will be very close up so I want the most realistic look possible. I looked at other tutorials on how to ...
3
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0answers
45 views

Waterfall Simulation looks terrible

Why looks my waterfall so terrible. The mesh isnt even stick together. It splits to often and i cant figure out why. I also backed with 300 but it doesnt matter. The splits are so annyoing unrealistic....
3
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110 views

Procedural Materials On Fluid Simulations

Been struggling with this for a while. I've made a procedural lava shader and I want to put it on a fluid sim. The problem is, all the mapping methods I've tried make the fluid travel through noise ...
3
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0answers
41 views

is there any way to get to velocity of a fluid and use it in the cycle material editor

I'm trying to use flip fluids to make lava is there any way to use the motion blur vectors, or get the velocity to mix a material. or in the script editor is there anyway to drive that.
3
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0answers
88 views

Fluid leaks even through two thick obstacles

In short: My moving obstacle leaks all the fluid that it's supposed to hold. I have tried tens of changes in the parameters (and all the solutions to similar questions), but it's not going to get ...
3
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0answers
670 views

Rendering fluid simulation and assigning material to water

I am working on some fluid simulations in Blender, however this tool is completely new to me and I am having some issues in rendering the output to have a realistic aspect. I have built a water basin,...
3
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0answers
109 views

Is it possible to programmatically get the underlying volumetric voxel grid from the fluid simulation?

I have some python scripts that generate and run a fluid simulation in Blender for me. To my understanding, Blender uses a voxel grid for it's volumetric fluid representation in the fluid simulator ...
3
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137 views

Is there a way to delete specific parts of a baked fluid simulation?

I'm working on a fluid simulation right now. At some places the fluid is seen through the obstacles. Is there a way to select those "false fluids" and remove them?
3
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1answer
154 views

Particle and Fluid Forces driven by motion vector image data (XYZ vectors). Optical Flow

I'm looking into how to achieve forces in Blender particles and fluids driven by motion vector image data. Think "optical flow". This is possible in Nuke, Houdini, and other packages. It appears ...
2
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14 views

Mantaflow in Blender: Help with understanding the vertices values in the generated mesh files

I'm currently trying to acheive the following: I'm using Mantaflow + Blender to create a fluid simulation. Then I'm exporting it as Alembic, and import it into Unreal Engine (Aka ue4). In UE4 I want ...
2
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0answers
30 views

How To make fluid human model and slowly dissapear?

i've been wondering how to make the scene like image shown At the first image, the character is fill with fluid, then the character melt down. Can this scene be done in fluid / flip fluid blender ? ...
2
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1answer
58 views

Fluid simulation only shows the domain

I was making a fluid simulation, but when I try to bake it, it only bakes the domain. The fluid doesn't appear from the inflow. Do you know why? Thanks. This is what appears when i render
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78 views

How to Create Shaving Foam in Blender 2.8

I really need to create a shaving foam shot for my final university short film, if anyone can help me with some professional techniques here are the storyboard images : Thanks in advance, Best ...
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246 views

Blender Snow Simulation

How to Create This Snow Simulation.
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122 views

fluid leaking through obstacles

I'm a beginner to blender, so please ignore my mistakes and be kind enough to guide me through this :) I've scene this question before, but never got a satisfactory answer. I'm working on two ...
2
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0answers
34 views

Weird dotted pattern in fluid simulation

I tried to simulate honey spilled from a bucket. The problem is that there is a dotted pattern on the simulation. What is causing this and how to fix it? The result: My settings:
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58 views

Imported Alembic (Animated mesh) I need it to have same # of vertices for fluid sim

I am working on a project where I plan to have multiple fluid sims running, I am having problems with my imported animated mesh, where each frame has different number of vertices. (This has previously ...
2
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0answers
84 views

Fluid is not falling towards gravity

I am animating a cube with a fluid in it falling or'jumping' on two objects and then ending on surface. But my fluid keeps falling towards the side where it was falling on the start. I have turned on ...
2
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0answers
55 views

Fluid does not reach the bottom of the domain - why not?

I am attempting to create a fluid simulation and I have created a cube for the domain (currently selected): The other cube has its type set to "fluid" and the angled rectangle is set to "obstacle". ...
2
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1answer
241 views

Fluid simulation and animation

https://www.instagram.com/p/Ba0fhHGAXxn/?taken-by=dkpatel25 As seen in above video I made the man using "control" property from Fluid simulation. How can I make the man walk or animate in any kind ...
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55 views

SSS + fluid render issues. missing parts

I am trying to render some fluid with SSS shader but I am getting some strange behavior. On the left you have a screenshot of the preview and on the right you have the render where you can see the ...
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0answers
194 views

2.78c | Changing fluid gravity direction results in really weird behaviour

I have a rather simple fluid simulation. My gravity is at -9.81, and it works nice, but I have animated the gravity and when it changes from -0.001 to 0 or a value greater than 0 the simulation breaks ...
2
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1answer
86 views

Fluid simulation pours into the cup in a box shape and won't spill

I was working with the fluid simulator in Blender, and I wanted to make an animation where water flows into a cup and spills out. When I bake the fluid it pours into the cup in a box shape, even if ...
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0answers
34 views

Size of fluid increasing with no understandable reasons

Initial volume: After rotating, size of fluid became bigger:
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0answers
432 views

How do I create a waterspout/vortex?

I need help on how to simulate a waterspout/swirl/vortex like the one in this image.
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1k views

Smaller drops in fluid simulation

I want to make a simple straight fountain. I used fluid physics - cube inside the domain is inflow type (Z velocity: 2). It looks like this: As it can be seen fountain is spurting with "compact" ...
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0answers
367 views

How to bake fluid and render at once

I am working on some blender projects with fluid and so I wonder how can I make my computer bake fluid and render with only one click. For now I always baked fluid and then clicked again to render. ...
2
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0answers
394 views

Offsetting tracer particles in a fluid simulation

I am working on an animation where I am using fluid tracer particles as a smoke flow object, and I have run into a problem. To get an idea of what I am trying to do, see my test render (of a simpler ...
2
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0answers
298 views

liquid inside complex shape?

I am working on this complex object. I want water to flow inside it, but, the liquid keeps escaping everywhere.
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0answers
51 views

Fluid physics very low res when poured into an obstacle that moves

I am creating an animation of an obstacle filling with fluid, and the obstacle is moving. When the obstacle is still the animation looks something like real fluids. When the obstacle/vessel is moving ...
2
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0answers
169 views

Fluid simulation no longer works

I'm trying to get some kind of Intro to work in which a chemical fluid turns into text. I was almost finished, but I can't get the thing with the fluid to work! A single drop should drop into an ...
2
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0answers
238 views

fluid simulation baking error

What I am trying is following: I want to "melt" a human body, so that the body turns into water and splashes onto the ground. OR that the human body is melting. Basically: to turn a more complex form/...
2
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1answer
660 views

how to make object float in water

How to make water pass through pipe with object link leafs and dust https://youtu.be/qGD1bD44B70?t=13s as seen video i want to make same as like they would make the leaf float wih water, I want ...
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0answers
31 views

More bubbles in fluid simulation

I am making a fluid simulation similar to this: I want the fluid simulator to create bubbles like in the picture. Blender fluid already creates a few small bubbles, and more depending on the quality ...
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0answers
21 views

Fluid animation seems to disappear in some frames

I wanted to create an commercial ad for a juice brand and was testing out fluid simulations.. for now my simulations seems to work properly but as I render the animation the fluid seems to disappear ...
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0answers
13 views

Problem with fluid simulation, cannot generate fluids through pipe

I have set up the scene and assigned inflow, domain and obstacle(pipe volume as a shell) and liquid not generating after complete bake
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0answers
90 views

How to melt an object into fluid and then morph into another object?

I am a beginner in Blender. I really want to accomplish a short 3D animation, I have built the models but I don't know how to deal with the animation. I watched many tutorials about fluid simulation ...
1
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1answer
31 views

Object floating on heavy sea - how to make shocking rotation less sensitive?

So I have an object floating on a heavy sea. How to make it a bit less sensitive to sudden rotation and location changes, and make it look more fluid instead? I used the technique such as described ...
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0answers
29 views

Submerged inflow doesn't add to fluid volume

So if you position your inflow inside the fluid, or where it's going to be submerged after a while, it stops producing fluid volume. Funnily enough, I've encountered the problem with both Blender ...
1
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1answer
49 views

Basic fluid - inflow too small to generate fluid or generated fluid too thick

I'm setting up a fluid simulation, and it seems like inflow is too small to generate any fluid, or generated fluid too thick(too much). This is the setting of the simulation: Inflow Volume ...
1
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1answer
40 views

Fluid simulation not generating fluid

I have a scene set up where the fluid generates from a "fluid" type. (not inflow or outflow, etc.) The fluid does not generate, it just makes a thin sheet at the top and corners of the spawner. It is ...
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0answers
77 views

Is Underwater hair simulation possible

Is it possible to make underwater hair simulation? I haven't tried it yet, but is it possible for hair particles to react to water particles?
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1answer
149 views

Export fluid simulation for usage in three.js

Is there any possibility to export a fluid simulation as an animation and import it in three.js? As I read in some threads it seems to be impossible to export a fluid simulation to a gltf, so I ...
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0answers
29 views

Why is my fluid sim is phasing through the obstacle?

I was trying to do an experiment so that my fluid would stick to a surface in little droplets (i.e. like water when it touches most surfaces because of intermolecular forces and surface tension). ...
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0answers
26 views

Fluid doesn't fall

I'm quite new in blender but this is really strange, please help! I want to simulate water flowing between letters and I have two issues: the water doesn't fall down but stays at distance from the ...
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0answers
40 views

What fluid obstacle movements cause the majority of fluid to disappear?

This is a narrow question, so your narrow answer is appreciated. At this point I do not want to include a picture. A fluid simulation was working well enough in timespan A. In timespan B an ...
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0answers
26 views

Fluid Simulation Outflow behaves unexpectedly. What are possible remedies?

A fluid simulation has one or more fluid outflows. One of the fluid outflows does change/delete the fluid, yet only at the boundaries/surface as depicted above. The expectation is any fluid should ...