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.

Filter by
Sorted by
Tagged with
23
votes
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... ...
12
votes
1answer
3k views

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 ...
3
votes
2answers
1k views

2D flow simulation over a surface

I'm very new to blender but keen to learn more. I have used a lot of 2 and 3D modelling packages as well as a number of GIS applications. I'm just trying to work out if I can model a fluid flow over ...
5
votes
2answers
4k 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 ...
11
votes
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. ...
10
votes
2answers
6k 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 ...
4
votes
1answer
1k views

Jet stream of water

I would like to simulate a stream of water like the one in the picture, but I don't know how to simulate the fast-moving, white water. Should I use particles to simulate foam or is it much better to ...
26
votes
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 ...
16
votes
1answer
5k 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 ...
4
votes
1answer
1k views

How To Make A Solid Object Drop To The Ground Like It Was Liquid

So I have a simple bouncing ball animation, but I just wanted to something "weird" for the ending. Is there a way to change the ball's material on the fly, where after the last bounce it changes ...
9
votes
2answers
6k 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 ...
18
votes
2answers
3k 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 ...
11
votes
1answer
9k 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 ...
7
votes
1answer
1k views

How can I make water follow a path?

How can I make water follow a path?
2
votes
1answer
286 views

Fluid, object, childof constraint animation - won't work

See this video for project example It's a simple project. I'm trying to create a fluid simulation flow out of a cylinder, but the cylinder has a "childof" constraint, paired to the cube above it. The ...
1
vote
1answer
2k views

Water Spray Simulation

I am working on a project where water needs to be sprayed so to form 60 deg full cone from the spray nozzle in an animation. I have tried it with inflow and v cylinder but when water leaves out it ...
14
votes
2answers
1k views

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 ...
16
votes
4answers
8k 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 ...
10
votes
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 ...
12
votes
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 ...
10
votes
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 ...
14
votes
1answer
2k views

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}) ...
8
votes
1answer
598 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 ...
5
votes
1answer
552 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 ...
5
votes
1answer
6k 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: ...
20
votes
1answer
3k 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 ...
15
votes
2answers
12k 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 ...
9
votes
1answer
5k 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 ...
2
votes
1answer
132 views

Fluid Simulation, make the fluid to be absorbed

I have a fluid falling on top of a plane. I want the fluid (water) to be absorbed by the plane, like a cloth would do. How can i do that? Thank you
15
votes
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 ...
4
votes
1answer
1k views

How to make my water look Murky?

Blender noob here again! I'm working on making a Swamp scene and I'm curious how I can make my water look murky/smokey. Would I need a smoke simulator in the system too? Or is it a materials thing? ...
3
votes
1answer
1k views

Is it possible to pause and later resume a fluid sim bake?

I have a pretty heavy fluid sim bake going on... by pretty heavy I mean I estimate it will take two weeks to complete! It is likely that during that time I will sometimes want to use Blender for ...
2
votes
1answer
289 views

Fluid gets Stuck in the Middle of Pipe

I am trying to simulate fluid running through an array of pipes into a destination tank. The fluid runs fine through my system until it reaches a bend in the pipe and then it just stops. The pipes ...
2
votes
1answer
1k views

What is the minimum size requirement for a Fluid mesh object in a Fluid simulation?

What is the minimum size requirement for a Fluid mesh object in a Fluid simulation? I've heard and read that if the mesh is too small, it may not act like fluid properly when baking. But, I don't know ...
0
votes
2answers
182 views

How to fix the weird surface in fluid object

Hi Guys, this is my first time to make a fluid simulation. However, I got some problem. The surface looks so weird. I am trying to make an animation so I do not decide to use sculpt mode to fix it. Is ...
11
votes
4answers
793 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 ...
3
votes
1answer
2k views

Prevent fluid to flow through the walls of an obstacle

I am trying to make a fluid simulation flow out of the orbits of this skull (I hope this doesn't violate any guidelines), as a little experiment / practice with fluid simulation. The result is not ...
4
votes
1answer
1k views

Can fluid respect soft bodies (or any deformation!) in blender?

Right now, I have a render that looks something like: this. As you can see, the fluid is ignoring the soft body simulation. Is there any way I could make the fluid respect the soft body simulation?...
4
votes
1answer
3k views

Is it possible to float an object on a fluid simulation?

This question is related to Physics cross-simulation interactions?. Is it possible to make an object float/interact with a fluid simulation? It doesn't have to be full two way interaction, but I ...
4
votes
3answers
5k views

Fluid going through a surface even though it is an obstacle

I have a problem with fluid going through an object even though I set it to be an Obstacle. I made a video explaining my problem. Settings: .blend and other related files here.
3
votes
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 ...
5
votes
1answer
4k 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 ...
5
votes
2answers
400 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 ...
3
votes
1answer
1k views

Is the ocean modifier better than the fluid simulation for making an ocean? [closed]

Is the ocean modifier better than the fluid simulation for making an ocean when it comes to visibility under the surface of the water, reflections and splashes in the water? Which one is better for ...
2
votes
0answers
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" ...
1
vote
1answer
718 views

how to convert a shape key animation to a fluid?

So I just finished this tutorial by Tutor4u using shape keys to convert a rolling ball into a wine glass. after that animation I would like to convert the wine glass into a fluid. The problem is I ...
6
votes
1answer
631 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 ...
4
votes
1answer
9k views

How Can I make a Fluid Simulation liquid become gooey or viscous?

I would like to change the properties of a fluid sim so that the liquid behaves gooey viscous. Which parameters would I have to change to get a slow, gooey viscous fluid. Much like hot sugar candy (e....
4
votes
1answer
925 views

Is it possible to bake fluid simulation into blend file?

Is it possible to bake a fluid simulation into a blend file, instead of a separate cache folder? The main reason is, I'm using a renderfarm to upload animation files. The renderfarm only accepts ...
4
votes
1answer
950 views

Fluid is floating instead of falling?

Instead of falling into this sink that I made, the fluid floats above. I'm not quite sure what's causing this. As you can see, my Domain is large enough so that it shouldn't be a problem: Settings: ...