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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Break apart grid pattern of foams in mantaflow fluid sim

In Blender 2.82, mantaflow was introduced, with a built in way to generate foam, bubbles, and spray. However, the particles all seem to be a bit too uniform, resulting in a grid like pattern. Is ...
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15 views

How to simulate vector sound waves in Blender?

I am making an animation where I visualize audio in the form of a vector sound wave. I am trying to make this "wave" with a line of stretched cylinders. The goal is to make waves that look like this ...
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7 views

Smoke following particles too much

So, I have a simple explosion scene set up in blender 2.82 and, when I preview the smoke, it's following my particles in so that the smoke just looks like a bunch of smoke bombs being shoved out. What ...
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1answer
17 views

Fluid Bake Not staying

I baked some fluid stuff and it was great. But when I saved the file and uploaded it to my online drive, the fluid bake didn't show up and I had to re-bake it again. How do I keep the bake so that I ...
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1answer
20 views

When building/compiling flip fluids, I just get a bunch of error s and a weird, partial build

Like the title states, when building flip fluid I get a partial build that can be installed as an add on into blender, but when I try to bake a sim it tells me that it cant find "libblpyfluid.dll" and ...
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16 views

Fluid and obstacle not colliding correctly [duplicate]

So I was creating a fluid sim, with the actual fluid set to inflow and shell, the cylinder was set to obstacle and to both (I also used a solidify modifier if that means anything), the problem occurs ...
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1answer
38 views

Weird Ripples on Shape While Using Fluids

I'm trying to create a heart that fills up with orange paint revealing its shape. However, I'm getting weird ripples on the sides. What am I missing? Here's a link to my Blender file:
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1answer
18 views

Fluid starting point

I want to run a fluid simulation, but I want the fluid to start at some other frame than the start. How do I make the simulation start on a farther frame?
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1answer
30 views

Bind water animation to keyframe

I'm currently making a bar scene. One of the guests is holding a keg upside down, I made the water animation for it. But I want to make the camera go through the stream of pouring beer at frame 180. ...
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33 views

Use Fluid Sim to Generate Smoke

I'm attempting to use Blenders fluid sim to create a smoke simulation, as I need to be able to export an Alembic (.abc) file into the Unreal Engine. As far as I've seen there are no addons to allow ...
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1answer
80 views

Mantaflow not baking fluids

So, I've created a simple fluid scene in blender (Domain, Inflow object etc.) but, nothing happens. I could do fluid with Mantaflow 2.81 Mantaflow branch back when I had it but, they've changed some ...
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16 views

floating fluid with force fields

Is there any way I can make fluid float in the air with force fields? I am trying to replicate this: Also, is there any plugin that would help?
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75 views

Mantaflow fluid bake at high quality?

I have been using Blender's fluid physics for a while now, and I have been wondering if it is actually possible to do a fluid bake at 1024 quality. What would this look like, and how could I achieve ...
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33 views

Rendered image is different than the frame in the baked fluid simulation. Blender 2.81

I have baked the fluid simulation and when I started rendering the animation, initial frame render the geometry as baked and next frame look different. If i render single image not an animation then ...
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3answers
48 views

Baking physics on several machines / Combining cache

I have a smoke animation in blender. I wonder if it is possible to split the baking process of Physics / Smoke Simulation on several machines. Can I run part of the simulation like Frame 1 to 100 ...
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13 views

Calculating fluid inflow to a rigid body

I have a fluid simulation that has an inflow object whose position in the scene is calculated by the rigid body simulator. Now what I want is the fluid in the simulation to continue to come from the ...
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1answer
82 views

Blender 2.82 Fluid Simulation can't resume baking

I have simulated a pool of water and was baking the mesh for the water. My system crashed and I could not resume baking. I backed the mesh folder up and freed the mesh. I put the files back in place ...
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77 views

Documentation on the mathematical models used by Blender physics engines

I need to know which mathematical models Blender uses during rigid body simulation and fluid simulation (e.g. Lattice Boltzmann). Is there something like that in the Blender manual or do I need to ...
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46 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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1answer
37 views

Physics: Liquid Splashes too much

I have a problem with physics. I am trying to make a spoon removing a fluid in a cauldron. The problem is when I introduce the spoon into the liquid the liquid splashes a lot. I tried changing a lot ...
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25 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 ...
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1answer
64 views

Problem with Fluids Tespassing Obstacles (bottles, cauldrons)

I have problems with physics. I modeled a bottle and I duplicated part of the bottle for the liquid. The liquid has a face on top so it is closed. The bottle is open on top. I added a cube for the ...
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10 views

Smoke jet simulation? [duplicate]

I would like to animate a jet of smoke as in this video clip (from the movie Interstellar). Here's a short preview: Note the important elements are: The smoke is translucent The smoke is very fast ...
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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....
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1answer
242 views

Displaying airflow inside of an engine model

Okay so basically I have a model of an engine. The purple shows where all the gas and yes gas not liquid should go. It must collide and be held in by a couple moving parts. The first thing I tried ...
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1answer
25 views

Physics simulation and image plane

I am trying to make some 3d video effect. Is it possible to apply physics simulation on an image/video plane such that it interact with other objects in the scene? E.g. can a video becomes fluid and ...
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23 views

Need help on moving multiple rendered images(frames) over a stationary plane

I created a dry fountain animation using fluid physics. The chosen objects were a cube(domain), cone(inflow) and a plane(as an obstacle). I baked them to create the fountain. Later I rendered the ...
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24 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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13 views

How to make a text coming-up-out of water simulation?

I'm working on a project for school, and I want to make a simulation of some text rising up out of some water, with water dripping from it, sliding off of it, etc. I've already tried finding ...
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16 views

How to Make Custom Mesh Hollow/Empty? [duplicate]

I am new to blender and trying to create a custom mesh (specifically, a trough to hold a fluid, see image). I have deleted all the edges on the top of the mesh, yet neither fluids nor meshes can enter....
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1answer
24 views

Why does my Fluid simulation look like there is a floor where there isn't one?

I'm trying to set up a fluid simulation to flow down this guys arm but it keeps ending up looking like this. Is there something I need to apply to make it not do this? Additionally, I can't seem to ...
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1answer
28 views

Guided liquid Simulation

I am a short movie director and after effects vfx artist and I'm just beginning with the blender vfx game. In an upcoming short movie I want to realize a scene where the blood flowing out of a ...
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1answer
46 views

FlipFluids & Ocean modifier as displacement. Baked frames in 3D view show all movements but rendered animation not. Manual keyframe ok. Any solution?

I have created a FlipFluids simulation in Blender 2.81 ( 2019-11-25 21:45) and added an Ocean modifier in displacement mode to the fluid_surface. Then I have baked the complete sim from within ...
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30 views

How would I go about simulating a flooded city?

I want to visualize what it looked like if a big city was flooded due to sea level rise. I want it to look as realistic as it can, but I am still kind of a beginner. So how would I do this? Do I need ...
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18 views

Resuming a Fluid Simulation

I am currently using blender 2.8 and working with fluid sims. Does anyone know if baking was interrupted for some reason, that if there would be a way to resume from the point the baking was ...
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1answer
158 views

When using Flip Fluids and enable whitewater any Foam Spray or bubble appear as these icospheres

I have a problem when enabling the whitewater in the Flip Fluids addon. I get these big icospheres that I don't know how to fix. I've changed a lot of domain settings and it doesn't make any ...
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17 views

Fluid animation doesnt bake after 5-10 frames

I'm trying to do a water bottle flip animation and have 2 obstacles 1 fluid object and 1 domain in my sketch. But whenever i try to bake the aniimation, it bakes like 5-10 frames and after that domain ...
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1answer
54 views

Fluid not interacting with obstacle correctly Blender 2.8

Fluid acts as if the obstacle is in a different location and orientation. Any fixes?
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1answer
29 views

Fluid sim not working, no liquid is being made

I've been trying to make a sim of oil flowing out of a pipe onto some objects I made for a school project. The problem is that no matter what I try, the domain doesn't seem to want to show up while it'...
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39 views

blender 2.8 fluid fill stops at inflow object height

I create a box domain, small sphere inflow and text letter converted to mesh as an obstacle. I want to fill the letter with water. After baking (tried several resolutions 75-220), the fluid flows and ...
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7 views

Fluid Simulation

for the past 4 days i have been trying to insert key-frame for water splash on my inflow material, starting at 1 and stopping at 30 but after baking it doesn't stop at the exact point i want it to ...
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6 views

I'm having trouble with the fluid physics in 2.79

I am attempting to make a running tap for an interior model, but i am having troubles with the actual physics of the water. i have applied all of the fluid physics to the inflow, the obstacle (the ...
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1answer
39 views

Fluid Sim and Particles

So I have set up a particle emitter and a fluid sim, the emitter particles do not interact with the fluid even when I set the emitter as an obstacle, also tried setting the object as an obstacle but ...
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38 views

Fluid disappears and appears during simulation on moving obstacle

I am trying to make an animation with fluid and some moving character(obstacle). Fluid is shooting from a gun towards the character. Fluid is like honey. Fluid is landing on character's body. The ...
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16 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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2answers
84 views

How can I create a realistic floor water fountain

I am trying to create a water fountain (as shown in the image). But for some reason after baking, all my inflows (UV sphere) are being interacted with each other ending up in a mess just like shown in ...
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95 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 ...
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23 views

Fluid simulator artifacts in Blender 2.8

So I'm trying to create a fluid simulation where water is falling down and hitting a rock. The only problem is that when the water hits the rock, the water, on one side, just bunches up in the most ...
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22 views

Fluid Simulation: Fluid is not coming from the inflow

I am trying to get fluid pouring from a sphere into this cup. However, when I bake the simulation the fluid also comes dripping down from places further along the x-axis from the sphere. What is ...
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28 views

Multiple fluid domains

So a few days ago I asked here how i could simulate water falling from tectonic plates and the answer given worked perfectly. But now I am having some more problems, I wanted to make 2 fluid ...

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