SPH method - in-canal flow

Ovunc2

Hello, 

I am trying to model the flow in the canal with the SPH method. The canal has the shape of a rectangular prism. I determined the surface where the flow will start by creating a csurf. SPH particles are produced in line with the normals of the elements on this surface. I aim for a continuous and dense flow of particles.

1. I think that if I make the mesh on the yellow marked surface more fine, the particles will become denser. I also observed this. However, all particles were not formed at the same time. Why could this be?
2. How can I make the particles in the x direction more dense? ( Is using finer mesh the only solution to this? ) 
3. Particles are occurring far apart from each other in the y direction. The particles are forming as in Figure 1. So I don't observe continuous flow. How do I ensure continuous particle formation?

I would be glad if you help.

Thank you. 

Best Regards, 

Ovunc 

 

 

                                        Figure 1

 

 

Ovunc2

Hello again, 

I wanted to explain the situation I mentioned on a simple model.

As seen in Figure 2, as the mesh size of the inlet surface decreases, the particles  become more dense in the y direction. But the particle gap has increased in the x direction. 

• Why is this occurring? ( Do you think the particle distances should be the same in the x and y directions?) 
• You can also see in Figure 2 that although they have the same fluid properties, the fluid is in different positions at time t. How can the input surface mesh size be determined?

Figure 1

Figure 2

Thank you. 

Best Regards, 

Ovunc