Prepare test case to simulate race car nose region using sample/sphere-example as reference

[acrlakshman]

@Blesscin @SubhitshaManikandan @mxnojkumar

[Blesscin]

I have done all things which you have mentioned in the sample case sir, what is the next process ?

[acrlakshman]

@Blesscin

What you have done?

• You ran the sphere-example case that I prepared and got it to run successfully.

What you need to do?

• Post-process your results and post paraview visuals in here.
• Make a copy of sphere-example case, and replace "sphere.obj" with "race car nose" geometry and redo all the steps, so that you have the visuals for race car nose geometry.
  • This point is the actual objective of this task.

[Blesscin]

OK sir let us try to the visualize the results

[Blesscin]

Almost done everything sir,but in paraview i cant able to fix the nose in Box sir, i have tried to change the dimensions but it didn't worked out

[acrlakshman]

Please share your test case here as a compressed file for me to take a look at it. I need to see blockMeshDict, snappyHexMeshDict, surfaceFileExtract..., nose_cone.stl or nose_cone.obj files. If possible all files of the test case.

@Blesscin @SubhitshaManikandan @mxnojkumar @SubhitshaManikandan @kummi0402

[Blesscin]

[Blesscin]

Real time Ground clearance of the vehicle is around 100mm and speed we can assume it as 100km/hr, How to find the reynold number sir ?

[acrlakshman]

Real time Ground clearance of the vehicle is around 100mm and speed we can assume it as 100km/hr, How to find the reynold number sir ?

@Blesscin

Re = density * velocity * length scale / (dynamic viscosity)

In this case, you can use

• density = 1.29 kg/m^3 (density of air)
• velocity = 100 * 1000 / 3600 m/s
• length scale = in this case, choose length of the nose cone i.e. along Y axis in your geometry, for your initial estimations
• dynamic viscosity = 1.8x10^-5 N-s/m^2 (of air)

Using above values, please do the calculation.

[Blesscin]

Found the reynold number using the above mentioned formula sir, from i found this is a turbulence model because reynolds number is > 2000

[Blesscin]

1) Bottom most coordinates point which is closes to ground : X = 0,Y = -250.091,Z = 108.97 2) Length = 1038.10mm, Width = 624.35mm, Height =500.18mm 3)Centroid of nose coordinates : X = 0,Y = 0,Z = 0

[Blesscin]

sir i have made a sketch of the enclosure Box in solidworks and then i got the 8 points X Y Z coordinates from that and applied in blockMesh, the code got runned with no error but the nose is in rotated position and i cant able to fix it in center with respect to ground clearance

[acrlakshman]

@Blesscin good work so far. Before our next meeting, I want you to give it some thought on what might be causing an issue for the incorrect orientation, so that we can fix it. Please use pen and paper and analyze of what might be the change that you need to do.

[Blesscin]

Coordinate points got from solidworks didn't come properly sir for the configuration you have given, so myself got the coordinate points using nose dimensions which is drawn using pen and paper later i have implemented those coordinates in blockMesh & done the process, but i cant able to get correct position of nose please help me to solve this sir i been trying this for an week.

[Blesscin]

As per your request i have created a branch with guidance of kumaresh sir & for creating the boundary condition i have done many times but i cant able to make it right,after a certain period of time it makes me loosing my interest, so as per my request kindly give me a demo session to fix it & proceed further

[Blesscin]

Boundary conditions are applied and simulated using simpleFoam

[kummi0402]

@Blesscin Thank you Kindly report the boundary conditions implied and capture the velocity vector and pressure behavior appropriately. In this image, I couldn't able to understand the influence of air over the domain.

[Blesscin]

Screencast from 04-04-24 08:02:36 PM IST.webm

[acrlakshman]

@Blesscin upload the updated results you have based on today' discussion, showing velocity vectors.

[Blesscin]

Velocity Vector results

[Blesscin]

Simulation results using PisoFoam

[Blesscin]

I can able to visualize the flow (very small changes in arrow movement)sir by changing the time step values and velocity from -1 to -0.1

[Blesscin]

I have followed all the steps step 1: Copy paste motor bike folder & paste in run step 2: controlDict: Write interval : 50,end time: 50 step 3: LES files: controlDict: end time: 0.5,write control : adjustable, write interval: 0.005 step 4: ./Allrun after running i have entered the reconstructparmesh and reconstructpar in terminal and created the a.foam but i cant able to see the object inside the boundary in paraview

[kummi0402]

Blesscin, can you attach blockMesh, surfaceFeatureExtract, and snappyHexMesh log files here ? Check the log files, where you will find the mistake. Have you tried to do that ? because you have resolved this step long ago

[acrlakshman]

closing this, as we are creating new ones to address specific parts of the project, while we are making progress.