[Mantaflow] Incorrect fluid flow direction #72643

Closed
opened 2019-12-22 17:01:13 +01:00 by Pavel Blend · 10 comments

System Information
Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: AMD Radeon HD 7560D ATI Technologies Inc. 4.5.13399 Core Profile Context 15.200.1062.1004

Blender Version
Broken: version: 2.82 (sub 6), branch: master, commit date: 2019-12-20 00:09, hash: c3782ebf44
Worked: (optional)

Short description of error
Fluid drops to the side. Fluid must fall strictly down.

Exact steps for others to reproduce the error
Run the simulation in this scene:
test_02.zip
And the particles will look like this:
01.jpg

**System Information** Operating system: Windows-7-6.1.7601-SP1 64 Bits Graphics card: AMD Radeon HD 7560D ATI Technologies Inc. 4.5.13399 Core Profile Context 15.200.1062.1004 **Blender Version** Broken: version: 2.82 (sub 6), branch: master, commit date: 2019-12-20 00:09, hash: `c3782ebf44` Worked: (optional) **Short description of error** Fluid drops to the side. Fluid must fall strictly down. **Exact steps for others to reproduce the error** Run the simulation in this scene: [test_02.zip](https://archive.blender.org/developer/F8240463/test_02.zip) And the particles will look like this: ![01.jpg](https://archive.blender.org/developer/F8240464/01.jpg)
Author

Added subscriber: @Pavel_Blend

Added subscriber: @Pavel_Blend
Member

Added subscribers: @sebbas, @JacquesLucke

Added subscribers: @sebbas, @JacquesLucke
Member

Changed status from 'Needs Triage' to: 'Confirmed'

Changed status from 'Needs Triage' to: 'Confirmed'
Member

Something looks very wrong here. I could not figure out what is causing this yet. Are you able to reproduce it in a new file? If yes, please provide exact steps to reproduce it.

2020-01-15 11-26-47.mp4

Something looks very wrong here. I could not figure out what is causing this yet. Are you able to reproduce it in a new file? If yes, please provide exact steps to reproduce it. [2020-01-15 11-26-47.mp4](https://archive.blender.org/developer/F8279584/2020-01-15_11-26-47.mp4)

Changed status from 'Confirmed' to: 'Needs User Info'

Changed status from 'Confirmed' to: 'Needs User Info'
Author

This error occurs in any scene. It is enough to increase the parameters Timestaps Maximum and Minimum. Here is the instruction:

  • Add domain (liquid)
  • Add a source of fluid (Inflow)
  • Set Timesteps Maximum and Minimum to a single value that is higher than the standard value. For example, set the value to 8.
  • Run the simulation.

In fact, this error is visible at low Timesteps, although less noticeable. With a value of 20, the simulation is extremely unstable:
manta.jpg

This error occurs in any scene. It is enough to increase the parameters Timestaps Maximum and Minimum. Here is the instruction: - Add domain (liquid) - Add a source of fluid (Inflow) - Set Timesteps Maximum and Minimum to a single value that is higher than the standard value. For example, set the value to 8. - Run the simulation. In fact, this error is visible at low Timesteps, although less noticeable. With a value of 20, the simulation is extremely unstable: ![manta.jpg](https://archive.blender.org/developer/F8279881/manta.jpg)

I think it all boils down to the Surface Tension value (Domain settings) in the file. Disabling it, i.e. change from 2.0 to 0.0, makes the liquid drop straight down again.

Investigating the influence of that value remains to do.

I think it all boils down to the `Surface Tension` value (Domain settings) in the file. Disabling it, i.e. change from 2.0 to 0.0, makes the liquid drop straight down again. Investigating the influence of that value remains to do.

Changed status from 'Needs User Info' to: 'Confirmed'

Changed status from 'Needs User Info' to: 'Confirmed'

Changed status from 'Confirmed' to: 'Resolved'

Changed status from 'Confirmed' to: 'Resolved'
Sebastián Barschkis self-assigned this 2020-01-21 21:08:53 +01:00

Closing this report since there is nothing to fix at this point. More information should go into the documentation instead.

Closing this report since there is nothing to fix at this point. More information should go into the documentation instead.
Sign in to join this conversation.
No Label
Interest
Alembic
Interest
Animation & Rigging
Interest
Asset Browser
Interest
Asset Browser Project Overview
Interest
Audio
Interest
Automated Testing
Interest
Blender Asset Bundle
Interest
BlendFile
Interest
Collada
Interest
Compatibility
Interest
Compositing
Interest
Core
Interest
Cycles
Interest
Dependency Graph
Interest
Development Management
Interest
EEVEE
Interest
EEVEE & Viewport
Interest
Freestyle
Interest
Geometry Nodes
Interest
Grease Pencil
Interest
ID Management
Interest
Images & Movies
Interest
Import Export
Interest
Line Art
Interest
Masking
Interest
Metal
Interest
Modeling
Interest
Modifiers
Interest
Motion Tracking
Interest
Nodes & Physics
Interest
OpenGL
Interest
Overlay
Interest
Overrides
Interest
Performance
Interest
Physics
Interest
Pipeline, Assets & IO
Interest
Platforms, Builds & Tests
Interest
Python API
Interest
Render & Cycles
Interest
Render Pipeline
Interest
Sculpt, Paint & Texture
Interest
Text Editor
Interest
Translations
Interest
Triaging
Interest
Undo
Interest
USD
Interest
User Interface
Interest
UV Editing
Interest
VFX & Video
Interest
Video Sequencer
Interest
Virtual Reality
Interest
Vulkan
Interest
Wayland
Interest
Workbench
Interest: X11
Legacy
Blender 2.8 Project
Legacy
Milestone 1: Basic, Local Asset Browser
Legacy
OpenGL Error
Meta
Good First Issue
Meta
Papercut
Meta
Retrospective
Meta
Security
Module
Animation & Rigging
Module
Core
Module
Development Management
Module
EEVEE & Viewport
Module
Grease Pencil
Module
Modeling
Module
Nodes & Physics
Module
Pipeline, Assets & IO
Module
Platforms, Builds & Tests
Module
Python API
Module
Render & Cycles
Module
Sculpt, Paint & Texture
Module
Triaging
Module
User Interface
Module
VFX & Video
Platform
FreeBSD
Platform
Linux
Platform
macOS
Platform
Windows
Priority
High
Priority
Low
Priority
Normal
Priority
Unbreak Now!
Status
Archived
Status
Confirmed
Status
Duplicate
Status
Needs Info from Developers
Status
Needs Information from User
Status
Needs Triage
Status
Resolved
Type
Bug
Type
Design
Type
Known Issue
Type
Patch
Type
Report
Type
To Do
No Milestone
No project
5 Participants
Notifications
Due Date
The due date is invalid or out of range. Please use the format 'yyyy-mm-dd'.

No due date set.

Dependencies

No dependencies set.

Reference: blender/blender#72643
No description provided.