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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6 views

Fluid simulation gone

Have a blender file where I've added a quick liquid. Played animation [hit space], works. Resized one object, no animation anymore. Undoing not helping. Adding a cube, adding quick fluid, no animation....
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How to fix low framerate while running animation in Blender 2.9?

How can I increase the FPS of my simulation after baking it? Details: I was following along with Olav3D's video on water animation in Blender 2.9 (great person to learn stuff from) and after baking I ...
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Fluid bake explodes and vanishes

I bake a fluid, but after a specific frame, the fluid explodes and disappears. It's completely normal at first, but after the same frame every time, the fluid loses volume and explodes into just a few ...
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How to make raindrops fall onto an object?

I have a solid effector object and to put it simply I just want it to get rained on. Ideally I'd like to have a Mantaflow emitter above the object simulate raindrops falling onto it. —— I've been ...
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Very less particles are spawning in fluid simulation

I was following default cube's honey tutorial https://youtu.be/viiOpt0JhfU?t=154 and ran into some problems. The number of particles that are spawning are very less than they should be. MY RESULT: ...
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1answer
23 views

Fire simulation won`t be randered

Tried to render fire simulation in Cycles, results are above. I added principled volume node to domain cube. Fire shows up in viewpoint, however does not in rendered image. In viewpoint, fire is shown ...
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8 views

Let fluid simulation hold final frame [duplicate]

I have a mantaflow liquid simulation in the 2.92 version of Blender. This simulation starts at the beginning of the animation but stops before the animation ends. When the animation plays past the ...
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19 views

Fluid Sim not working when using a small flow object

So i'm trying to create a fluid sim, using a UV sphere as the flow. I have added a cube as a domain, following CG Geek's tutorial. However, when I scale the flow object down to a small size, it does ...
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24 views

Mantaflow Liquid bake crash EXCEPTION_ACCESS_VIOLATION

So I am doing a scene with a fluid sim, and basically a glass with water in it gets broken. So it's split up into a hundred rigid bodies and I bake the sim on top of that with the rigid body sim ...
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1answer
17 views
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10 views

Fluid doesn't work, particles simply won't appear

I'm following this tutorial precisely step by step (I'm using blender 2.92) https://www.youtube.com/watch?v=e3mhJXuveFo&t=91s When it comes to 1:26, the particles just dont show up. What could be ...
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I made a pile of balls using particle system and physics and now i want to replicate and transform this pile as an object not a simulation

I tried going to modifiers tab and click convert on the particle system modifier, but that tries to convert the whole simulation and crashes my pc , I only want to convert one frame of the simulation ...
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14 views

How do i make a solid object into water for a animation? [closed]

Is there a way for a solid object to sit there for about 10s and then just turn into water? I want to make an animation for an abject to turn into water after some time.
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My mantaflow fluid simulation is going the wrong way

so i am working on this project, and my fluid seems to think that the y axis is the x axis?? the fluid flows to the wall instead of the floor, like as if gravity has flipped
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21 views

How do I change fluid material in a simulation

Been at it for a couple hours every youtube video they already have a material on their fluid but mine is just a bunch of particles not a liquid, I have 0 experience in liquid animations so any help ...
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12 views

How do I set specific parts of a mesh as outflow and have other parts just an effector?

I'm trying to do a fluid sim and I want to have certain parts of a mesh/object as inflow, and others as outflow. I'm just trying to set some of the faces as inflow and the rest as effector or ...
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1answer
65 views

How to create physically accurate boat moving through water

I am am making a short realistic animation of a sailboat going through the ocean. I have an ocean modifier with the time animated. I have a plane shrink wrapped to the ocean and the sailboat model ...
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10 views

Is it possible to maintain the last image of the baked fluid simulation as a still? [duplicate]

I made a fluid simulation for fog (frame 1 to 10), and I want the fog to remain as it is at frame 10. I'm animating something else in the file until frame 260, but I want the fog to remain as it as in ...
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1answer
34 views

Smoke Effect Colors Overly Dark and Gray When Rendering with Cycles or Eevee in Blender 2.92

I tried to make a multi colored smoke effect because it looks cool. Unfortunately, this feature only seems to work with Workbench Render Engine while in wireframe view. Indeed, once I try to render ...
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91 views

Is there a way to make a fluid collide with another fluid?

I want 2 fluid simulations to collide together. However, there isnt an option to have a fluid be both a domain and effector. How would I make 2 fluids collide? Here is an example: The picture isnt ...
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6 views

Trouble with part of fluid sim disappearing on flat surfaces

I have a fairly simple problem with a fluid sim that I haven’t seen posted anywhere else. So I have a fluid draining out of a scene revealing a flat object with collision to avoid clipping. The fluid ...
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13 views

Flow source for liquid sim is coming out of wrong object

I have 2 domains and 2 flow sources. I want to have one domain release fluid from the left flow source (the smaller rectangle), and the other from the right. I put each cube in its own collection, and ...
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1answer
25 views

Fluid dissapears while moving

I'm having a problem with this simulation. When the fluid starts to move it seems to lose mass and I don't understand why. If you compare the volume of the fluid at the beginning and the volume at the ...
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1answer
61 views

Mantaflow: bake always crashes, cannot be resumed

I have problems baking a smoke simulation with Mantaflow, I tried Blender 2.92 and 2.93 Alpha. When baking a (not very complex) simulation, Blender always crashes at around 30% of a 250 frames ...
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14 views

liquid collision effector result changes with minor location change

After a solution to yesterdays "fluid not crossing a vertical Effector boundary" I now have yet another subtle Effector problem where a slight location change causes an effector to stop the ...
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1answer
9 views

How to continue bake fluid simulation in blender 2.80

I have baked a fluid simulation which baked till 151th frame out of 240 frames, Now I want to continue the bake from 151th frame. Can we do that in 2.80 Blender
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21 views

fluid not crossing a vertical effector boundary

I have the "H" shaped mesh (converted from Text object) Collider Effector that is allowing fluid to pass through the verticals, but as the mesh fills the fluid never crosses into the ...
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2answers
67 views

Is it possible to put an image on a liquid body?

I'm trying to get a melting effect of an image by making a viscous liquid cube but I can't find any way to arrange a UV to the liquid. Is there a way around it?
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29 views

Simulating Color Doppler with Blender

I am preparing a presentation for radiology residents. I'd like to use Blender to explain some caractheristics of color Doppler ultrasound (US). Basically, Doppler US allows you to see the blood flow'...
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23 views

Fluid Simulation not visible in blender 2.90.2

I have no clue what am I doing wrong, please help me with this. Fluid Simulation is not working when I make a domain of my own, these are my settings: But when I use quick liquid it worked: Here is ...
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22 views

Coloring fluid simulation in Cycles according to speed and direction

I am trying to create a fluid simulation where the color of the fluid particles will change according to their direction AND their velocity. In the beginning, the fluid moves horizontally in the +X ...
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19 views

Is there any shortcut to recalculate smoke/fluid simulations?

While working with smoke/liquid, I often have to go to cache and press "Is Resumable" twice in order for parameter changes to update the simulation (the workaround I found so far). Is there ...
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10 views

smokefluid simulation without “quick smoke” does not work

I made two simulations: One with quick smoke that works fine in rendering (left) and one where I manually made a fluid-domain and a fluid-inflow object (right). Both work in solid view but only the ...
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72 views

In Blender 2.9 how to use fluid control?

I have a question about fluid simulation. In Blender 2.9 how do you express something like the image below? I downloaded the .blend file posted on the question page below, but it doesn't seem to work ...
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1answer
50 views

capturing a frame simulation of cloth, particle as initial state

I want to be able to simulate a cloth or fluid for a while and then capture a frame and set it as an initial state/frame to a future simulation. Example use cases: winding a cloth thread on a spool,...
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23 views

Fluid not following “Follow Path” object constraint

I have a sphere following a circle around by simply making the circle curve it's "Follow Path" parent. This makes the sphere go around the circle in 100 frames. But when I apply a simple ...
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1answer
52 views

spray/foam/bubbles not showing in Mantaflow fluid simulation

I have enabled spray, foam, and bubble particles in my simulation, but they don't appear in my renders. Viewport: Detailed, foamy, dramatic crashing water. Render: Boring, blobby, uninspired, and ...
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1answer
15 views

Fluid mesh isn't showing in Mantaflow simulation

The blue preview particles are showing, but whenever I tick the "Mesh" box under the physics properties on the domain, nothing happens. I've done multiple bakes with the box ticked, but it ...
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40 views

How to make fluid settle

I've created an animation of wine pouring into a glass, the problem is after the simulation is done and the fluid still splashes outside and goes over itself in the glass. I want it to slowly settle ...
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21 views

Create Mesh from texture shader or or particle systems

Blender has algorithms to generate mesh surfaces for a fluid simulation. Is there an API to use this algorithm with other data? For example, is it possible to mesh a surface based on a volume shader (...
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19 views

Question concerning alembic imports

I just had "Storm Simulation Tool" calculate a fluid sim. It exported it frame by frame as alembic files. Unfortunately Storm does not say whether it uses 'Ogawa' compression or not. Blender ...
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1answer
24 views

Fluid simulation problem

I have set two fluid sims up with the same settings. The tall one is working and the fat isn't. Why? Blender file: https://drive.google.com/file/d/1RixIoagHAfQyhVYKxJgwd50fsP405hu0/view?usp=sharing
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31 views

Approach to get the effect of Mixing Fluids - texture distortion or mantaflow/particles?

I'm trying to get the effect of mixing the fluids of different colors. First I was trying to get it done with mantaflow. But cant get to assign different colors to inflows. But there is another ...
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1answer
25 views

Water not coming out in fluid simulation

I am doing a practice project but in this water is not coming out of it. can you tell me what's wrong in it? Here's the file:
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16 views

Fluid simulation doesn't fall

I am beginning to simulate fluids in blender and doing my first one I see that water stays in the middle of the simulation and does not fall. Someone knows why this might happen? Thank you
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8 views

Blender viscosity simulation resetting domain [closed]

I made a render of honey using the viscosity https://imgur.com/4FEGjMx This is the render I did earlier of it and now it has messed up.
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15 views

I am trying to make a drum rotate with water fluid [closed]

I am trying to make a drum rotate with water fluid. I'm looking for a clear explanation of effector and domain. Effector fails to fill in the shape. I just want to fill a horizontal cylinder with ...
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1answer
39 views

Soft body squishing

I need to make a short animation displaying a soft paste bieng squished between two surfaces like the photo below. Could anybody point me in the right direction?
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1answer
95 views

blender (2.92 BETA) liquid simulation with viscosity becoming really stretched on one side

I am experimenting with the new "Viscosity" feature in the liquid settings in blender version 2.92 Everything was working the way I wanted it to, until I noticed that during the simulation, ...
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2answers
65 views

Fluid is “too heavy”/doesn't splash

I'm trying to reproduce CG Geek's tutorial creating a wine glass and fluid: https://www.youtube.com/watch?v=9bZkivGauxY. While I created the wineglass on my own, I just wanted to focus on the fluid ...

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