[Piloten]

Hello everyone

I'm currently simulating flow and thermal field for a car body and am considering developing a axis symmetric boundary condition. The tunnel and the car body is entirely symmetric lengthwise let's say.

I've tried to find research done on this example but was unable to find any. What type of flow behaviors could I expect which would not be axis symmetric? I've thought of vortex shedding which would not be axis symmetric but since I'm not interested in drag I don't think it matters. Reynolds number in the domain will vary around approximately 50 000 so it's well into the turbulent zone.

Are there any more errors I should think of or do you have any research papers that you think would be good to read? Please let me know.

[FMDenaro]

Originally Posted by Piloten

Hello everyone

I'm currently simulating flow and thermal field for a car body and am considering developing a axis symmetric boundary condition. The tunnel and the car body is entirely symmetric lengthwise let's say.

I've tried to find research done on this example but was unable to find any. What type of flow behaviors could I expect which would not be axis symmetric? I've thought of vortex shedding which would not be axis symmetric but since I'm not interested in drag I don't think it matters. Reynolds number in the domain will vary around approximately 50 000 so it's well into the turbulent zone.

Are there any more errors I should think of or do you have any research papers that you think would be good to read? Please let me know.

Your assumption is good only for a statistical approach, that is in the RANS formulation.

[junbon]

Originally Posted by Piloten

Hello everyone

I'm currently simulating flow and thermal field for a car body and am considering developing a axis symmetric boundary condition. The tunnel and the car body is entirely symmetric lengthwise let's say.

I've tried to find research done on this example but was unable to find any. What type of flow behaviors could I expect which would not be axis symmetric? I've thought of vortex shedding which would not be axis symmetric but since I'm not interested in drag I don't think it matters. Reynolds number in the domain will vary around approximately 50 000 so it's well into the turbulent zone. Snow Rider 3D

Are there any more errors I should think of or do you have any research papers that you think would be good to read? Please let me know.

When simulating flow and thermal fields around a car body with axisymmetric conditions, be aware that vortex shedding, boundary layer development, and wake instabilities can introduce non-axisymmetric behaviors, even if the geometry is symmetric. At a Reynolds number of 50,000, turbulent flow may lead to chaotic patterns affecting heat transfer and pressure distribution. Additionally, surface roughness can further complicate the flow. It’s important to consider these factors in your simulation to ensure accurate results.