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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Mantaflow issue: can't stop liquid flow

So I have no idea what's going on but I am following a CG Geek tutorial trying to learn how to make fluid simulations but I've come across a huge issue that I can't figure out. He suggests to add two ...
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55 views

Liquids flows to weird direction. (It flows toward one area of the domain object)

I'm doing some assignment with Blender to use physics simulation, and I found my fluids are flowing to a weird direction. The fluid was supposed to flow downward, because that is how it usually works, ...
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443 views

Fluid sim not colliding with effector

Okay, a pretty simple problem, you can see the fluid sim is passing through my effector. How do I fix that? So far I've tried flipping the normals, adding and applying a solidify modifier, and ...
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23 views

Rendering Fluid

Why is my computer not rendering the liquid as we see it perfectly in wireframe view? I try to fill a bottle with water using the fluid modifier. This works correctly, but in render view effectors are ...
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Remove the offset thickness from IsPlanar efffector option?

I have a character model which interacts with fluid. The mesh has some holes, but instead of closing these holes, I decided to just use the "Is Planar" option. It works much MUCH more ...
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1answer
53 views

water simulation -Move water upward along a slope

I want to make a simulation where water move upward along a topography opposite to what it does under normal gravity. I dont want just to water behave like smoke and go straight upward but to behave ...
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45 views

Mantaflow : Fire disappears for one frame then comes back

I am currently making an animation of a rocket launch, and I'm using mantaflow to simulate the engine fire. After getting the settings I wanted, I baked it and it looks good, but on several of the 200 ...
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14 views

Unable to get liquid to flow when on a rotating object [Blender 2.90]

I'm trying to make an animation, imitating a spin-coating process commonly done in photolithography. However, I can't make my liquid spread once my object starts spinning. Any help please? Link: https:...
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63 views

Blender Buoyancy

I was just thinking if there is any way I could simulate buoyancy in blender. What I would need is to simulate debris dropping in the water and some of the would rise to the surface and some would ...
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19 views

How do I measure the volume of water in a certain area?

I want to make a water simulation where I measure how effective a sea barrier is, and at which angle it should be to the water in order to maximize effectiveness. Since I obviously need a quantitative ...
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33 views

Trying to Make Zero-G Manipulatable Liquid

I’m basically trying to find a way to control a fluid simulation, or something that looks like fluid, in a way that would allow me to have the fluid follow one point, but still allow it to deform ...
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34 views

Expanding fluid

Almost all tutorials with fluid have the fluid in gravitational field, so that you can see it splashing around. But is there some way to create a thick fluid coming out of the source and pushing the ...
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71 views

How to create a liquid meniscus/bridge between two surfaces

I'm trying to model a water droplet between two plane surfaces such that it forms a capillary bridge as soon as the surfaces get into close proximity of each other like in the first figure of this ...
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Fluid simulation – change object type

Question: Given a fluid simulation, is it possible to change the 'Type' of a given object, halfway through the simulation? Context: Let's say I have three ice-cubes that are melting. At frame 1, the ...
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Center fluid particles on source

My fluid particles start quite far away from my source object (see picture). I enabled planar emission otherwise it doesn't work (???). But the surface emission is set to 0. EDIT: The source is inside ...
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1answer
84 views

How to make a particle simulation like this?

So here is the reference https://www.instagram.com/p/CHijzp2gVt7/ I don't ask for like exact guideline how to make it, but if you can throw me a few steps or tutorials for something specific as this. ...
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84 views

Blender Fluid Simulation Inflow From Particle System With Liquid Simulation

I can't figure out how to make liquid inflow come from the particle system. I know smoke and fire simulation can use particle systems. So how can I make particle systems work with liquid simulation? ...
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55 views

2.9 fluid obstacle slip-type equivalent

In blender 2.80 there is a slip-type for fluid obsticles. But is 2.82+ this setting has been removed. What and where is the equivalent setting?
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232 views

Operator Search: 'Free Data' not available in Blender 2.9 anymore?

I have a problem with caching my data when I try to run 'replay mode' for a fluid simulation in 2.9. In the 2.8x versions, you can 'free the data', when you search for ...
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1answer
43 views

Fluid simulation stays in its own space?

I am trying to make a fluid simulation in a very simple dam. I have read tons of documentation, videos and forum posts however I am not able to resolve my problem perhaps because I don't know exactly ...
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41 views

Problems with fluid simulation not rendering

I have been trying for the past few days to render my fluid simulation. Everything is perfect and I love what it will be but when I render out the animation the animation is just the floating liquid ...
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1answer
212 views

How can you create a 2d fluid/paint animation effect?

I'm trying to create an animated version of this image, sort of like a cartoony paint-mixing effect. My first and simple approach was to screen-record a fluid simulation toy (there's plenty on the ...
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118 views

Fluid Simulation with Forces Blender 2.9. How do I get useful results?

This is about the built in Fluid Simulation with Blender 2.9 Yes I do see the effect of the gravity force and [force[shape curve]]. Will other forces work with Blender? Such as Harmonic? When I try ...
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19 views

Material to Vertices (rendering vertices)

I know a similar question has been asked on this forum already, but I just can't believe there is no other option to render vertices differently than the classic, performance killing way- by ...
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16 views

How to fine tune mantaflow fluid simulation?

I am currently trying to replicate this type of consistency of fluid with mantaflow (First image). After tweaking lots of settings left and right I still cant get a very fine fluid. I only get a very ...
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125 views

Box of Fluid domain is visible when checkbox “use flow” is deactivated

I'm new to blender and trying my first fluid simulations. I have the problem that the fluid domain box is visible as solid in the viewport and rendered mode when the checkbox for Use Flow is ...
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63 views

Fluid Simulation Collision Not Working

By some miracle I managed to get a simple fluid simulation (kind of) working, but the collision objects I've set up are completely wonky, and some of the fluid just passes right through the surface. ...
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23 views

Simple Fluid Simulation isn't working - No fluid is generated

I am following a simple fluid simulation tutorial found here. But I just can't get the fluid to actually generate anything when I press play on the timeline. I have a filled circle as the inflow ...
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23 views

Volume Loss of fluid simulation in tilting Object which is defined as an effector (collision) Blender 2.90.1

I have the following problem. I have a casting ladle as an effector with collision setting. I beginn with fluid inside the ladle as a geometry with the inner shape of it. This works pretty smooth but ...
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1answer
104 views

Mantaflow use in blender

.Blend file I am a blender beginner and after watching some tutorials online I figured I'd give modeling and animation a try. I am trying to make an oil hourglass animation that will move the liquid ...
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27 views

Best way to allow water to flow inside this mesh? [duplicate]

I am a blender beginner and after watching some tutorials online I figured I'd give modeling and animation a try. I am trying to make an oil hourglass animation that will move the liquid downwards.The ...
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10 views

Same file, slower FPS baked data playbak in weaker computers

When playing back a fluids simulation on the 3d viewport (just the simulation. No mesh, no lightning. Just the baked data): I get low FPS on my beefy PC, while I get better FPS count on other machines ...
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47 views

Both my fire emitter and my domain became 'wireframe', can't see them in render view

I was trying to make some fire, and Blender is bugging a lot when I use fluids. The print is an example of 1 of the things that happen. Both my emitter and my domain became 'wireframe' only, even ...
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1answer
60 views

Whats the difference between these two?

[![enter image description here][1]][1]what is the difference between these 2 ? can you please sepcify and how to convert the atoms one diagram to the solid form one, can you please tell the steps? i ...
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1k views

Fluid: How to convert the simulation to a series of meshes?

Once you've baked your fluid simulation, you can apply the Fluid in the Modifier panel in order to get one mesh that you can edit etc... But how can you get the whole series of meshes, i.e. one mesh ...
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17 views

Imitating controll object in mantaflow?

Before mantaflow there was a "control" type in fluid types. It allowed to do some things like liquid forming an object or waterbending the liquid in shapes. How do I achieve similar effect ...
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1answer
69 views

“Domain Type” and other options not showing

(new to blender) I'm trying to change my domain type from smoke to gas, however my smoke domain settings are completely different from the tutorial I'm watching and I'm not sure how to change them.
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1answer
117 views

Particles in fluid-simulation are falling through Object

I made a fountain in Blender. The fluid simulation looks like it works, but in the last part of the Fountain it falls through it. I had a similar problem few weeks ago and I solved it by increasing ...
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1answer
269 views

Sampling Substeps in fluid-simulations

I'm new to Blender an i'm learning something about fluid-simulations. In the physics settings of the flow-object is a setting called: "Sampling Substeps". I have played arround with the ...
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48 views

Cold smoke simulation

I want to create a cold smoke simulation to make a ghost-like object. I want the smoke to be flowing downwards, similar to the one in this video: https://www.youtube.com/watch?v=d8V16BFxGNs&list=...
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1answer
126 views

No “Final” option under Physics Properties > Cache > Type

My question is pretty simple. In all the tutorials I've watched at some point the instructor says to set the option Physics Properties > Cache > Type to ...
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1answer
212 views

I would like to simulate spiky ocean waves from an old animated cartoon

Recently I watched a German movie called Käpt'n Blaubär: Der Film. I loved this movie as a child and when I re-watched it I was really impressed with the wave physics. They are unrealistic and over ...
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168 views

Why is my mantaflow liquid/fluid exploding?

I am making a liquid simulation with mantaflow in blender 2.82. For some reason my liquid keeps exploding after sometime. I used different resolutions, lowered the inflow, expanded the domain to try ...
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238 views

Blender Mantaflow: Meaning of Liquid Particle Colors

Can someone explain me the difference between the particle colors in mantaflow. I have a simulation where some water is dripping down. The first part of the animation is going fine, until some green ...
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16 views

Why don't “control” show up in fluid types in blender 2.8 and 2.9 for me?

It is supposed to be there: As shown in this website: https://b3d.interplanety.org/en/fluid-simulation-in-blender-2-80/ But instead I have: I need the control object but for whatever reason I cannot ...
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101 views

Space between fluid inflow and effector

I have a fluid sim with an inflow and a collision effector, but there is a gap between the two. I have applied all transforms. The origins are all in center of mass. the effector was a plane. I have ...
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234 views

Export/ Import alembic trouble / blender 2.9

I got some trouble with alembic export/import. I tried to export and reimport a fluid simulation but when i do so the importet mesh is not animatet. Further are all stages of the animation on top of ...
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1answer
300 views

FLIP Fluids - How to include foam & bubbles when exporting the geometry?

I am using the FLIP Fluid add-on to generate a water simulation. I managed to export the animation into .obj sequence but here is the problem now. The Foam & Bubbles particles generated from FLIP ...
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1answer
55 views

fire simulation don't show fire but smoke [duplicate]

Im trying to do a fire simulation. Although I have it as fire on setting Physics property panel, my simulation still showing only smoke. Can anybody please tell how to fix this? Thanks in advance.
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14 views

Fluids repelling away when hitting moving effector

Using 2.9 After a few hours of playing with every fluid setting trying to figure out why the fluid just sprayed everywhere when it hit the effector, it obviously ended up being the last thing I ...

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