Robert V. Shannon Jr. March 18, 2014 Technical Excellence - - PowerPoint PPT Presentation

▶

robert v shannon jr march 18 2014 technical excellence

Robert V. Shannon Jr. March 18, 2014 Technical Excellence - - PowerPoint PPT Presentation

Oct 10, 2022 476 likes •648 views

Practical CFD-DEM Software Needs and Issues in Agricultural Crop Flow Modeling Robert V. Shannon Jr. March 18, 2014 Technical Excellence Innovation Quality Engineering Combines 4 Main Flow Problems Under-hood or engine

slide-1

SLIDE 1

Practical CFD-DEM Software Needs and Issues in Agricultural Crop Flow Modeling

Robert V. Shannon Jr. March 18, 2014

Technical Excellence Innovation Quality Engineering

slide-2

SLIDE 2

Combines – 4 Main Flow Problems

 Under-hood or engine cooling type flows (not discussed today)  Augers and Conveyors for crop conveyance  Sensors and optimizing Sensor design  Chaffers and Cleaning Shoes

Technical Excellence Innovation Quality Engineering

slide-3

SLIDE 3

Augers & Conveyors

 High particle density  Relatively Low Speed  Little or no air interaction  Rotating and/or Sliding Walls

Technical Excellence Innovation Quality Engineering

Characteristics

slide-4

SLIDE 4

Augers & Conveyors

 Particle Throughput Capability  % Grain Damage vs. Throughput  Instability Threshold  Power Requirement vs. Throughput

Technical Excellence Innovation Quality Engineering

Data Sought and Post-Processing Needed

slide-5

SLIDE 5

Sensors & Optimizing Sensor Design

Technical Excellence Innovation Quality Engineering

Characteristics  Moderate particle density  Relatively Low Speed  Little air interaction  Rotating and Sliding Walls

slide-6

SLIDE 6

Sensors & Optimizing Sensor Design

 “Time” Averaged Forces (pt.)  “Time” Averaged Moments (axis)  “Time” Averaged Impact Contour  Sensor sensitivity with different crop and grain moisture content

Technical Excellence Innovation Quality Engineering

Data Sought and Post-Processing Needed

slide-7

SLIDE 7

Sensors & Optimizing Sensor Design

Technical Excellence Innovation Quality Engineering

slide-8

SLIDE 8

Sensors & Optimizing Sensor Design

Technical Excellence Innovation Quality Engineering

slide-9

SLIDE 9

Cleaning Shoes & Shoe Elements

 VERY High Particle Density  Crop dependent air interaction  Chaff, Leaf and Grain Particles  Entire subsystems oscillating and fans operating

Technical Excellence Innovation Quality Engineering

Characteristics

slide-10

SLIDE 10

 “Time” Averaged Forces (pt.) and local peaks  “Time” Averaged Moments (axis) and peaks at sensor locations  Lateral particle distribution  Fan Power requirements  Clean Grain Cleanliness  Grain Loss

Technical Excellence Innovation Quality Engineering

Data Sought and Post-Processing Needed

Cleaning Shoes & Shoe Elements

slide-11

SLIDE 11

Technical Excellence Innovation Quality Engineering

Cleaning Shoes & Shoe Elements

slide-12

SLIDE 12

Technical Excellence Innovation Quality Engineering

Cleaning Shoes & Shoe Elements

slide-13

SLIDE 13

Current Force and Moment Information Available

Technical Excellence Innovation Quality Engineering

slide-14

SLIDE 14

Critical Needs for Combine “Non-Underhood” Shoe CFD

 Overlapping Overset/Chimera Grids with DEM  General time averaged force and moment data  Flexible Particles – corn leaf “hair-pinning”, spearing, etc.  Collision time splitting  Individual particle time step subcycling  Turn off linear momentum solving for “surrounded” particles  No air source term updates for particles with tp >> Lcell/Vp  Statistical Parcel representation of SOME DEM particles in a simulation

Technical Excellence Innovation Quality Engineering

slide-15

SLIDE 15

Questions, Contributions & Discussion

Technical Excellence Innovation Quality Engineering

Contact: TechniQual Engineering Corporation P.O. Box 132 Silvis, IL 61282-0132 email: CombustionInc@yahoo.com Phone: +01 1 563 343 7001