SimScale simulation projects by DaleKramer | Page 1

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I've been wishing for years to have the time to run one of my Lazair's thru CFD!

To calculate the lift & drag rotating cyclinder

An FEA study of the stresses in an aluminum tube/sheet structure and also in a Western Red Cedar part as a saddle for inflatable pontoons.  Also, I have a look at the stress in the skin of the inflatable pontoon.

To investigate bending displacements of rectangular press plates.

Compare the Lift/Drag ratio of a Mentor XS paraglider wing shape as if it were a solid wing with no air intakes, with the Mentor XS that has its original leading edge air intakes.

A hydrofoil to lift a Lazair out of the water

Just the CAD  with five geometries.. The first, with smooth wheels and no hubcaps for now, it does include window wells and 35 inch wheels.  The second, has, more correct, 13 inch width tires that match more closely the width of the tires on the launch day vehicle and a more correct version of the hubcap that was on the CyberTruck 'launch' vehicle which I created from scratch by reviewing video frames from 'launch' day videos.  The third, with the body widened by 0.1 meter along the door panels, while the side body panels maintain their width at the front and rear of the vehicle.  The fourth, is the same as the third with tread added to the tires that is similar to the 'launch' vehicle.  The fifth, is the same as the fourth with the addition of a 1.5 inch bump/kink in the rear body slope at the rear of the side windows.

This CAD has been scaled to published exterior dimensions and wheelbase has been set to match what the 'launch' vehicle was estimated to be.

To look at the results differences between 2019 TET algo meshes and 2020 TET algo meshes

To verify that TETforCFD meshes can provide accurate CFD results that closely match experimental results.

The first simulation uses a mesh that is well layered which has 0 illegal faces...  The second simulation has a mesh that ERRORs with floating point exception error...  The only change that the 2nd mesh had was the addition of an Inside Cartesian Box  Region Refinement that tried to refine the 0.5 meter area around the car body to a finer Level 6 size...  When that refinement was added, the mesh creation errored...

CyberTruck with rotating treaded tires and hubcaps.  Vehicle is 'airplaning' (like 'hydroplaning') at 10mm above ground...

Created to investigate that a geometry from old project shows as watertight but when that geometry is exported from old project and then that downloaded geometry is used in a new WB project, then watertight rating disappears.

Test of Feature refinement and as to whether anyone can add a 'Staff Pick' tag

Optimizing a mesh for accurate results in a simulation

Trying to apply some FEA methods to an airship envelope.
This envelope is symmetrical front to back so I have only drawn the front half of the envelope and will use a symmetry plane.
The envelope is made out of 76 micron PET plastic film.
I would like to analyse envelope shape and stresses with 3.5x10-4 MPa gauge pressure inside it using air, helium and hydrogen as the internal gas (air at STP will be the gas outside the envelope).
I am hoping that there will be a way to account for the shape and stresses in the fabric that takes into account even the weight of the fabric itself.

I want to know if this pillow cavity can be completely filled by low pressure from a plastic extruder's nozzle

The main issue of this project  is the proper interpretation of Force Results for Simulations where Inlet Air angles are  not perpendicular to the inlet face. For these cases, the Force Results need to be rotated by the inlet air angle so that they represent true Lift and Drag forces.  This project presents a method to obtain the rotated force results, almost automatically, in the Solver Log.

Trying to apply some FEA methods to an airship envelope. This envelope is symmetrical front to back and side to side so I have only drawn a quarter of the envelope and will use symmetry planes. The envelope is made out of 76 micron PET plastic film. I would like to analyse envelope shape and stresses with 3.5x10-4 MPa gauge pressure inside it using air, helium and hydrogen as the internal gas (air at STP will be the gas outside the envelope). I am hoping that there will be a way to account for the shape and stresses in the fabric that takes into account even the weight of the fabric itself.

Using modified geometry of project tcc_rodolfo and using Fluid Volume Extraction

tcc_rodolfo
Dale1 made fan into a solid that Rhino recognizes and reduced fan diameter to 1.466 m for clearance to MRF of about 6 mm from about 2 mm

Third attempt, better models, better knowledge

The main issue of this project  is the proper interpretation of Forces and Moments Results for Simulations where Inlet Air angles are  not perpendicular to the inlet face.

This challenge is about designing your own lightweight design along with amazing renderings. The objective function is to reduce the weight of the wing without exceeding the maximum allowable deflection (+y direction) of 1 meter!

Video about the challenge: https://bit.ly/2TE3HPr

This project studies the affect of Maximum Tet Edge ratio in a mesh and SimScale Bonded Contact definitions with respect to seemingly abnormally high von Mises stress in an FEA simulation.

To determine how much difference in results values will be seen if 1 boundary layer is used instead of the more accepted practice of 3 layers for a CFD HEX mesh (with unattached flow) within a very strict yPlus wall function range of 20-175 using the kW_SST turbulence model.  The meshes have about 99 percent of the geometry surface area within yPlus20-175.

Four times a year the National Association for Stock Car Automotive Racing (NASCAR) visits oval tracks larger than 2.0 miles in length (Daytona and Talladega). These four events utilize restricted intake motors in order to decrease the overall horsepower and, ultimately, the overall speed of the vehicles. A consequence of this reduced horsepower is the increased dependence on the aerodynamic drag advantage gained by drafting behind either another car or a group of cars.

Previous work has studied the effects of the draft between two Ahmed Bodies as well as two NASCAR style vehicles, but there is limited information about the draft effect on more than two vehicles. This project uses the simplified Ahmed Body with a minimal grid to study the relative effects of the draft as the number of vehicles in line increases. The goal is to find the optimum number of vehicles for total draft reduction.

This project investigates a way to more efficiently obtain good convergence and results for simulations using 'TETforCFD' meshes.

To determine how much difference in results values will be seen across a range of layering from 0 to 4 boundary layers of a CFD HEX mesh (under unattached flow conditions) within a very strict yPlus wall function range of 20-300 using the kW_SST turbulence model.  The meshes have about 99 percent of the geometry surface area within yPlus20-300, with a yPlus surface average of 100 and the mesh refinement changes between meshes is only in the Layering Refinement while keeping the same 1st layer thickness and layer Expansion Ratio on the non zero layer meshes.

Trying to confirm existence of the issue in another geometry and  simulation

1. Evaluate the effectiveness of auto-ranged y+ surface maps in determining if a strict y+ range applies to a mesh/simulation run...................
2. Develop additional metrics to determine if a mesh/simulation run applies to a strict y+ range.

The first simulation uses a mesh that is well layered which has 0 illegal faces...  The second simulation has a mesh that ERRORs with floating point exception error...  The only change that the 2nd mesh had was the addition of an Inside Cartesian Box  Region Refinement that tried to refine the 0.5 meter area around the car body to a finer Level 6 size...  When that refinement was added, the mesh creation errored...  OK SOLUTION was to increase Cartesian Box/Distance from surface Refinement level until it meshed without error...

Investigate strict yPlus ranges and the affects on simulation Results of having yPlus outside of strict ranges for a single geometry and multiple sim parameters.

This is a further analysis of the original project that investigates strange residual behavior with TETforCFD meshes based on 'New mesh preview' mesh algorithm.

Compare the Lift/Drag ratio of a Mentor XS paraglider wing shape as if it were a solid wing with to air intakes, with the Mentor XS that has its original leading edge air intakes.

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