Subdomain error/ Vehicle simulation set up

[intishd]

Thanks! I just set it up like it looks and tried to start a simulation, but got his error:
There are settings defined in the simulation setup which have empty assignments and hence will be ignored for the simulation run. Names of the settings that will be ignored: Subdomain 1

Could that be because I have nothing assigned here, and if so, what do I have to assign?

Also, could you take a look at my project and see if the setup in total is fine?

SimScale Login

Cheers

[tsite]

Hey there, this is a warning, which indicates that you have set an unassigned Subdomain under the initial conditions. You can either delete this, or ignore the warning (I suggest you do the deleting though):

Regarding your set up, I have two questions:

1. How did you calculate the rotational velocity of your wheels? ( ω =U/r , where U is the linear velocity and r the radius of the wheel)
2. What did you use as a reference length for your coefficients under the Results Control? (It should be the length of the car across the y-axis)

Please change the direction of your forces according to your orientation cube, Lift is Iz, Drag is dy , Pitch is x (-1 as it is negative x-direction). Have a look here under the Results control.

Finally, It would also help to activate the potential flow initialization.

Best regards,
Fillia

[intishd]

1. I calculated it by dividing 20/0,0245, where 20 is the velocity and 0,0245 is the radius of the wheels in meters.
2. For the Reference Length, I used the length of the vehicle across the y axis which is 0.1765 meters

I changed the force directions, so that’s all good. Do I have to assign anything to the region refinements, and if so, what exactly? In the tutorial its not possible to assign anything so thats why im asking.

Cheers

[tsite]

Ah I see, this is not a full scale vehicle Then it should be alright!
Give it a try and let me know how it goes.

[intishd]

Yeah its for a school competition I’ll try it now

[intishd]

I managed to finish the Analysis and I’m trying to get some nice screenshots of it now, but the particle trace looks VERY weird, what happend there?

[tsite]

Try to ‘experiment’ with the settings a little bit:

[intishd]

I think it looks pretty good now, what do you think?

[tsite]

Much better, you can also add an Animation of the streamlines in your presentation
Cheers!

[intishd]

I just did We can’t use it in the presentation tho because its only pictures I believe, I’ll still record it tho