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

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 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

Augers & Conveyors Characteristics  High particle density  Relatively Low Speed  Little or no air interaction  Rotating and/or Sliding Walls Technical Excellence Innovation Quality Engineering

Augers & Conveyors Data Sought and Post-Processing Needed  Particle Throughput Capability  % Grain Damage vs. Throughput  Instability Threshold  Power Requirement vs. Throughput Technical Excellence Innovation Quality Engineering

Sensors & Optimizing Sensor Design Characteristics  Moderate particle density  Relatively Low Speed  Little air interaction  Rotating and Sliding Walls Technical Excellence Innovation Quality Engineering

Sensors & Optimizing Sensor Design Data Sought and Post-Processing Needed  “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

Sensors & Optimizing Sensor Design Technical Excellence Innovation Quality Engineering

Sensors & Optimizing Sensor Design Technical Excellence Innovation Quality Engineering

Cleaning Shoes & Shoe Elements Characteristics  VERY High Particle Density  Crop dependent air interaction  Chaff, Leaf and Grain Particles  Entire subsystems oscillating and fans operating Technical Excellence Innovation Quality Engineering

Cleaning Shoes & Shoe Elements Data Sought and Post-Processing Needed  “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

Cleaning Shoes & Shoe Elements Technical Excellence Innovation Quality Engineering

Cleaning Shoes & Shoe Elements Technical Excellence Innovation Quality Engineering

Current Force and Moment Information Available Technical Excellence Innovation Quality Engineering

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 t p >> L cell /V p  Statistical Parcel representation of SOME DEM particles in a simulation Technical Excellence Innovation Quality Engineering

Questions, Contributions & Discussion Contact: TechniQual Engineering Corporation P.O. Box 132 Silvis, IL 61282-0132 email: CombustionInc@yahoo.com Phone: +01 1 563 343 7001 Technical Excellence Innovation Quality Engineering