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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315 views

How do I colour a fluid simulation in Cycles based on velocity?

I want to assign a gradient to the water simulations I have. I want to do this by the velocity in the current voxel, so the fastest moving areas will be red and the slowest blue. How would this be ...
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0answers
710 views

Converting an obj sequence to a .bobj fluid sim cache?

I'm wondering if there is any way to accomplish turning an obj sequence exported from realflow into a .bobj fluid cache that I could then trick blender into loading as a native fluid sim cache. So far ...
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78 views

Mantaflow simulations causing strange diamond artefacts

I've create a fluid simulation with mantaflow and am rendering the FLIP particles themselves (no mesh). The simulation looks great (with a resolution of 96) but when it becomes quite turbulent there ...
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0answers
57 views

is there any way to get to velocity of a fluid and use it in the cycle material editor

I'm trying to use flip fluids to make lava is there any way to use the motion blur vectors, or get the velocity to mix a material. or in the script editor is there anyway to drive that.
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0answers
315 views

How to light liquid on fire?

I'm trying to simulate liquid being lit on fire, but only the fluid works when I simulate both domains (the fire domain is on the second layer). I tried to find a tutorial for this, but wasn't able ...
4
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0answers
472 views

How to create very realistic rain with a particle system surrounded by a fluid domain?

I am working on a scene for a short film in which it is raining on a desert. One of the shots will be very close up so I want the most realistic look possible. I looked at other tutorials on how to ...
3
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0answers
837 views

Mantaflow liquid, Blender 2.82a - Not using the GPU

I'm baking a liquid simulation with Blender 2.82a. I have an Nvidia GTX 1060 running in an HP Z600 workstation with twin Xeon CPU's. The baking is only using my CPU's not the GPU, even though I have ...
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0answers
49 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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0answers
224 views

Procedural Materials On Fluid Simulations

Been struggling with this for a while. I've made a procedural lava shader and I want to put it on a fluid sim. The problem is, all the mapping methods I've tried make the fluid travel through noise ...
3
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0answers
95 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 ...
3
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0answers
805 views

Rendering fluid simulation and assigning material to water

I am working on some fluid simulations in Blender, however this tool is completely new to me and I am having some issues in rendering the output to have a realistic aspect. I have built a water basin,...
3
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0answers
114 views

Is it possible to programmatically get the underlying volumetric voxel grid from the fluid simulation?

I have some python scripts that generate and run a fluid simulation in Blender for me. To my understanding, Blender uses a voxel grid for it's volumetric fluid representation in the fluid simulator ...
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0answers
229 views

Is there a way to delete specific parts of a baked fluid simulation?

I'm working on a fluid simulation right now. At some places the fluid is seen through the obstacles. Is there a way to select those "false fluids" and remove them?
3
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1answer
176 views

Particle and Fluid Forces driven by motion vector image data (XYZ vectors). Optical Flow

I'm looking into how to achieve forces in Blender particles and fluids driven by motion vector image data. Think "optical flow". This is possible in Nuke, Houdini, and other packages. It appears ...
2
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0answers
79 views

Using full CPU to bake mantaflow simulation

I have dual 8-core Xeon e5-2780 0 (2.7ghz) processors, and 128gb of RAM. When trying to bake mantaflow fluid simulations, even the simplest simulations take forever because usually it is only using a ...
2
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0answers
483 views

Blender 2.82 Liquid Simulation: Flask mesh as an obstacle just passes through

I have a flask mesh (UV Sphere+Cylinder Bridged -> Solidify Modifier -> Subdiv Modifier), applied as an obstacle in Bender 2.8 Mantaflow sim. The liquid just passes through. I double checked the ...
2
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0answers
120 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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0answers
35 views

How To make fluid human model and slowly dissapear?

i've been wondering how to make the scene like image shown At the first image, the character is fill with fluid, then the character melt down. Can this scene be done in fluid / flip fluid blender ? ...
2
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1answer
167 views

Fluid simulation only shows the domain

I was making a fluid simulation, but when I try to bake it, it only bakes the domain. The fluid doesn't appear from the inflow. Do you know why? Thanks. This is what appears when i render
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0answers
121 views

How to Create Shaving Foam in Blender 2.8

I really need to create a shaving foam shot for my final university short film, if anyone can help me with some professional techniques here are the storyboard images : Thanks in advance, Best ...
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0answers
420 views

Blender Snow Simulation

How to Create This Snow Simulation.
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0answers
171 views

fluid leaking through obstacles

I'm a beginner to blender, so please ignore my mistakes and be kind enough to guide me through this :) I've scene this question before, but never got a satisfactory answer. I'm working on two ...
2
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0answers
46 views

Weird dotted pattern in fluid simulation

I tried to simulate honey spilled from a bucket. The problem is that there is a dotted pattern on the simulation. What is causing this and how to fix it? The result: My settings:
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0answers
70 views

Imported Alembic (Animated mesh) I need it to have same # of vertices for fluid sim

I am working on a project where I plan to have multiple fluid sims running, I am having problems with my imported animated mesh, where each frame has different number of vertices. (This has previously ...
2
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1answer
563 views

Speed of baking fluid simulation slows down drastically

When baking a fluid simulation the process slows down. The simulation has object of type inflow and object of type control. The speed of baking will go down from rate 1 frame/min to 0.06 frame/min ...
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0answers
109 views

Fluid is not falling towards gravity

I am animating a cube with a fluid in it falling or'jumping' on two objects and then ending on surface. But my fluid keeps falling towards the side where it was falling on the start. I have turned on ...
2
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0answers
62 views

Fluid does not reach the bottom of the domain - why not?

I am attempting to create a fluid simulation and I have created a cube for the domain (currently selected): The other cube has its type set to "fluid" and the angled rectangle is set to "obstacle". ...
2
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1answer
56 views

Strange ladder effect on fluid

I have an issue I seem to keep coming across with the fluid simulation; I seem to be generating a strange 'ladder effect' where the fluid spreads out regular intervals as shown in the image below. ...
2
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0answers
57 views

SSS + fluid render issues. missing parts

I am trying to render some fluid with SSS shader but I am getting some strange behavior. On the left you have a screenshot of the preview and on the right you have the render where you can see the ...
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0answers
210 views

2.78c | Changing fluid gravity direction results in really weird behaviour

I have a rather simple fluid simulation. My gravity is at -9.81, and it works nice, but I have animated the gravity and when it changes from -0.001 to 0 or a value greater than 0 the simulation breaks ...
2
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1answer
130 views

Fluid simulation pours into the cup in a box shape and won't spill

I was working with the fluid simulator in Blender, and I wanted to make an animation where water flows into a cup and spills out. When I bake the fluid it pours into the cup in a box shape, even if ...
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0answers
35 views

Size of fluid increasing with no understandable reasons

Initial volume: After rotating, size of fluid became bigger:
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0answers
526 views

How do I create a waterspout/vortex?

I need help on how to simulate a waterspout/swirl/vortex like the one in this image.
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0answers
2k 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" ...
2
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0answers
399 views

How to bake fluid and render at once

I am working on some blender projects with fluid and so I wonder how can I make my computer bake fluid and render with only one click. For now I always baked fluid and then clicked again to render. ...
2
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0answers
407 views

Offsetting tracer particles in a fluid simulation

I am working on an animation where I am using fluid tracer particles as a smoke flow object, and I have run into a problem. To get an idea of what I am trying to do, see my test render (of a simpler ...
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0answers
343 views

liquid inside complex shape?

I am working on this complex object. I want water to flow inside it, but, the liquid keeps escaping everywhere.
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0answers
51 views

Fluid physics very low res when poured into an obstacle that moves

I am creating an animation of an obstacle filling with fluid, and the obstacle is moving. When the obstacle is still the animation looks something like real fluids. When the obstacle/vessel is moving ...
2
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0answers
190 views

Fluid simulation no longer works

I'm trying to get some kind of Intro to work in which a chemical fluid turns into text. I was almost finished, but I can't get the thing with the fluid to work! A single drop should drop into an ...
2
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0answers
253 views

fluid simulation baking error

What I am trying is following: I want to "melt" a human body, so that the body turns into water and splashes onto the ground. OR that the human body is melting. Basically: to turn a more complex form/...
2
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1answer
702 views

how to make object float in water

How to make water pass through pipe with object link leafs and dust https://youtu.be/qGD1bD44B70?t=13s as seen video i want to make same as like they would make the leaf float wih water, I want ...
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0answers
9 views

Is there a way to achieve two-way coupling in fluid simulations in Blender?

Usually in fluid simulations in Blender (I'm using Blender 2.90 and the fluid sim is done with Mantaflow), the Effectors can affect the fluid is the scene. However, the fluid cannot move any objects ...
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0answers
14 views

Fluid Simulation issues

Real quick, here's a snapshot of my specs: CPU: Intel i7-10700 GPU: Gigabyte 2070 Super 8GB RAM: Samsung 16GB Now I'm still new to blender and to simulations and what not, but I was following along ...
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0answers
20 views

Setup for more “splashy” fluid 2.8

I'm making a simulation of object dropping into the water. In previous version of Blender it gives nice, big effect of splashing and air bubbles around an object. However, using mantaflow surface of ...
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0answers
14 views

Interactive fluid simulation

I have been a Max user for years but I am trying to learn blender now. I am working on a fluid simulation at the moment. I am using eeve as a render engine. The simulation itself is quite simple: a ...
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0answers
18 views

Record water / liquid simulation animation to then transform it?

is it possible to record an animation created through water liquid simulation on a plane. Then fix this transformations that where recorded so you can transform the object without recalculation the ...
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0answers
51 views

Fluid emerging from random part rather than flow object - Blender 2.82

I was trying fluid simulation in blender 2.82, but the fluid seems to be coming from some invisible object inside the domain rather than from the inflow object that I specified, The domain boundaries ...
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0answers
13 views

Particles/fluid attaches or fills the volume of an object

Holla, Right, so I'm curious on how to achieve a certain effect via two different approaches. What I'm sort of trying to achieve: https://www.youtube.com/watch?v=KFYFh8w4758 Case 1: I'm looking for a ...
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0answers
40 views

(V2.83.0) Mantaflow fire + gas - How to scale emitter

I have been testing mantaflow for the last few days and have a simple problem. I want to create a rocket launch animation. Now fire and smoke should come out of the engine. This works great. But the ...
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0answers
43 views

Fluid simulation - Where are the slip options for domain boundary and collision effectors in Blender 2.82 and above?

I'm sure I've seen these options before, but I really can't find the settings for the slip type in Blender's UI - at least not in 2.82. I found them in the documentation for 2.80: https://docs.blender....

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