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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26
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1answer
2k views

Is it possible to simulate an egg?

Is it possible to simulate an egg? Specifically, I was wondering how to handle simulating the yolk. I was thinking fluid simulation, but it seems you can't a specify different viscosity for ...
24
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1answer
2k views

Physics cross-simulation interactions?

For example, rigid bodies and fluid. I know it's kind of possible by setting the rigid bodies as fluid obstacles, but it's not "true" interaction in that the fluid does not affect the rigid bodies... ...
21
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4answers
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What is the most computationally efficient way to make ripples?

I know you can use Dynamic Paint as well as Fluid Simulation with Force Fields to make ripples. I'm sure there are other ways as well. Which way is the least memory and processor intensive of these?
20
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1answer
4k views

How to make a wake behind a boat

The advanced students in my class are about to animate the dual paddle wheel steamboat 3D model that I gave them. I'm wondering if it is possible to attach a 'V' shaped wake behind it, perhaps on a ...
18
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2answers
4k views

How to make an object appear to be buried in sand?

My first thought was to use a fluid simulation, but that would act too much like liquid and too little like sand, unless there's some way to configure it differently. Ideally, I want it to look like ...
16
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1answer
6k views

How to apply gradient color change in an animation

How to apply color gradient change on a fluid such as in the following figure? The method should be capable to apply to all frames in the animation automatically. Consider it as simulation of being ...
16
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4answers
9k views

Why does the water keep escaping in my fluid simulation?

I am trying to do a water simulation. I have a small cup that I have created in blender (as an obstacle) and my water source (just an oval). My domain box is large enough to encompass both the glass ...
15
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2answers
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Ink on Porous Paper or Water Bleed Effect

I have seen some rather incredible results out there using smoke and dynamic paint, and as such, I am curious if anyone can come up with a clever simulation of ink onto paper, or, closely, ink into ...
15
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3answers
13k views

Water leaks through obstacle

Every time I try to hold water with a obstacle, it leaks out. Here is one example I have made. The shape has no holes, and the water is partially contained but slowly leaks out. This has occurred ...
15
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2answers
2k views

How can I make a fluid simulation in game engine

Is there a way to simulate a fluid in the game engine? It doesn't have to be 100% realistic (but not a cycling 2D animation). It just needs to be recognizable as water. Optimally, there should be a ...
15
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2answers
3k views

How can I create a crashing wave effect?

I have a scene with a stormy ocean, and I am trying to create this effect: I've been looking for tutorials on "crashing wave" or "ocean spray" without much luck. As such, I've run up against a wall. ...
14
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2answers
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How do I get rid of unwanted corners inside a bent tube?

I am trying to make a clear tube in Blender and have a water simulation run through it. I made the tube out of a Bezier curve and a circle, then extruded the original until I had the shape and length ...
14
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1answer
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Why does fluid (water) stick to the top of an obstacle?

In our simulation, Fluid (water) drops on an obstacle and splashes. It mostly works fine, but there is noticeable part which remains on top of the obstacle! In reality, there should be no water there, ...
14
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1answer
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How to attach colors (e.g., gradient color) to fluid particles

This is follow up question based on {this post}, indeed. The question is how to attach color attribute to fluid particles? For example when a part of colored fluid (as explained {here}) ...
12
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1answer
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Bake Fluid Simulation via CLI or Python?

I would like to run a fluid simulation on a headless Ubuntu machine I have lying around. I did manage to find a bug report on the issue but to no avail. Has anyone else had any success? Or perhaps a ...
12
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2answers
6k views

River simulation - different approaches than fluid simulation?

I am in the middle of a project which needs to have a river flowing in it. (You may be familiar with my recent questions; they are all related.) Just for reference and imagination, here's a preview of ...
12
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1answer
10k views

Simulate objects falling into water

On the blender website there is this image: What would I need to do to recreate this, cubes and spheres falling instead of fruit would be fine. I believe this uses the cycles render I have never used ...
11
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4answers
2k views

How can I make drops of fluid hang from a surface?

The images below display the kind of effect that I'm looking for. A combination of surface tension and intermolecular forces make drops of water hang on things (though they may occasionally fall off ...
11
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2answers
7k views

How to bake multiple fluid simulations in one scene?

If we understood correctly, Blender does not allow more than one domain for fluid simulation in a given scene. This means that any inflow (fluid) object will be transformed into only one domain object ...
11
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4answers
18k views

Fluid simulation not baking

I am trying to bake a fluid simulation in Blender 2.67. Here is a mockup of my scene: My scene is set up just like the picture, with a sun lamp above a mesh that is supposed to be a riverbed. The ...
11
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3answers
4k views

Different materials for each fluid inflow?

How to assign a different color / material to each inflow object in one simulation (bake)? In the following example we tried to mix two inflows and experience the mixing between the two fluids. ...
11
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1answer
3k views

Is it possible to create a fluid simulation of rain?

Is it possible to simulate rain with the fluid simulator? I tried to do something with a bunch of Inflow cubes that get enabled and disabled, however this is very tedious. Is there a better way? I ...
10
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1answer
2k views

How can you use vector blur in Cycles with fluids?

I know (at least I believe this to be true) that using cycles motion blur wont work with fluid simulations when rendering, however, I know that vector blurs can be used in place of motion blur. With ...
10
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2answers
6k views

How to completely fill an object with fluid?

I know how to make obstacles and inflows in Blender, but I do not know how to simply select an object and have it be filled totally with fluid. What tool/command/setting do I need to have an obstacle ...
10
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2answers
1k views

How to resume baking fluid simulation?

It happens sometimes that after finishing bake (e.g., for fluid simulation) we wish we could continue the simulation for two more seconds :( How to use the ...
10
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2answers
881 views

Fluid Domain disappears in cycles viewport render

I'm experiencing this weird behavior with a fluid domain. It looks like something is occluding the object whilst there's nothing else in the scene. Even if I apply the FluidSim modifier, I still ...
9
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2answers
8k views

How to stop fluid inflow?

I have fluid simulation with an inflow object. I want the inflow to go for 2 seconds, then have the inflow stop (so no more fluid is added) but keep the simulation going (so the existing fluid ...
9
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1answer
6k views

How to create a continuous flow of water?

I have built a water slide and pool and I want to make a animation of the water running down the slide and into the pool. The problem is I need the water to be created at the top and go away at the ...
9
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1answer
6k views

How to avoid fluid appearing outside collision objects?

In fluid simulation as it is done on a grid with a resolution definable even choosing a higher value for the resolution (as in our example below, 200) it is not enough to have a realistic shape of the ...
8
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1answer
3k views

Mapping a texture onto a fluid

Mapping an Environment Texture onto a fluid in blender works normally, even with image sequences/animated textures, but I can't seem to figure out how to map an Image Texture onto a fluid. Really, I ...
8
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1answer
633 views

Fluid Simulation: Inflow is stretching to the edge of domain when baked

Here you can see an animation of my fluid sim. The inflow is that small black circle. For some reason, the fluid flows in from the space between the inflow and one edge of the domain... Here are a ...
8
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3answers
2k views

How to calculate specific liquid volume?

I'm new to Blender and have a question regarding modeling of realistic scaled objects. I'm modeling a complex shaped bottle and I would like to scale it (using metric values) to hold a specific volume ...
8
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3answers
1k views

How to make beer foam

I want to make a beer foam, not just for an image. I want the beer fluid to pour in the glass and automatically make foam on the top of the glass and drop down due to over flow. It should be in ...
8
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3answers
1k views

simulate interaction of fluids with different viscosity

Like everybody else in this site I've been new to blender for quite some time... I'm trying to do an animation to simulate a mix of paint blobs with different colors, like Ebru Painting or ...
7
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1answer
1k views

How can I make water follow a path?

How can I make water follow a path?
7
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1answer
1k views

No “obstacle” option in fluid type

I'm trying to make gas flow through a tube. I've watched many videos demonstrating similar procedure. And they simply add a cube or any other object, go to the 'physics properties', click 'fluid', ...
7
votes
1answer
826 views

How to make a water vortex

I'm very new to Blender and I'm trying to make a water vortex like this.(may be not the easyest first project for a newbie) I watched several tutorial on liquids particle etc but I'm not sure what ...
7
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2answers
821 views

Why can't I have an inflow with an animated mesh output to local coordinates?

If I check Export Animated Mesh for an Inflow in fluid dynamics, I lose the option of using local coordinates. Why? What can I do about it?
7
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1answer
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Does the setting for domain size make a difference if the units are set to something other than None?

I've been trouble-shooting a fluid simulation and something that kept sticking in my throat was that my Fluid World scene size was set to 0.5 meters when my domain was actually much larger than that. ...
7
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0answers
124 views

How to simulate water pushing a wheel [duplicate]

I would like to make a water wheel that can be rotated due to flowing water. I made the wheel as an obstacle and enable collision physics. Is it possible to let the water (fluid simulation) interact ...
6
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2answers
5k views

'Bake data' button not visible in fluid options

(new to blender) i am trying to create a fluid sim in blender 2.83 but in my physics tab under domain there is no 'bake data' button in the options. It's there in all the tutorials i've watched but i ...
6
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1answer
685 views

Hair Particle system and Fluid Simulation interaction

Making a scene with grass made with a hair particle system in a fluid simulation. I was wondering if there is any way for the hair particles to be able to sway based on the fluid simulation. If so how ...
6
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2answers
3k views

Problem with fluid simulation, cannot get fluid to move up a thin pipe

Hi all So I created a little pipe system which I require water to flow through. It's meant to start by the water getting sucked up through the thin pipe currently located in the water and then flow ...
6
votes
1answer
7k views

For Fluid Simulation, what do the Start, End and Speed settings mean?

How do the Start, End and Speed settings work? Isn't the Speed setting determined by the Start and End settings? For example, say I have 120 frames (at 30fps, thus 4s), and I set "Start: 0", "End: ...
6
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1answer
5k views

Can rigid bodies interact with fluid domain?

I've been starting to familiarize myself with the fluid domain. My initial goal was to drop a cube (rigid body physics, gravity drop) into a fluid domain and see if I could get a splash. I made the ...
6
votes
1answer
833 views

Fluid emission doesn't follow animated inflow object

I am animating some text (converted to a mesh) shake around in front of the camera. After that, I want it to turn into a fluid and fall away. I tried going to the starting point of the mesh falling ...
5
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3answers
803 views

How do I make more complex LEGO simulations in Blender?

In the lego movie, the fire, water, and smoke is made of lego bricks. It's not just a simple method of having one type of brick, several different bricks and brick slopes are used to get a really ...
5
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2answers
5k views

Water ripples / waves on the surface of an object

I would like to create a character made of water. To do this, I am trying to do it with a simple sphere first. I tried to apply modifiers to the sphere to get it to move and undulate like water ...
5
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2answers
586 views

Baking a Fluid at 150res crashes, but baking at 300res doesn't?

I've been having this problem for a good week now. I have a very simple scene set up. Water comes out of a pipe and lands in a pan. There's literally nothing else. That being said, whenever I try to ...
5
votes
1answer
128 views

Understanding Fluid dynamics - ridiculously large tmp folder

Recently, I've received access to a high-performance PC; I wanted to check on its capability with Blender's fluid dynamics. First, I set simple system of fluid domain, fluid inflow, etc., with Final ...

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