Coupling principle of fluid and floating body
I have read the following literature carefully(http://dx.doi.org/10.1016/j.cpc.2016.01.006), and I still have some question about the coupling principle between fluid and body. I know how to calculate the force between float and float or between float and boundary. But I have a lot of doubts about the force between the fluid and the floating body, this literature does not cover more details in this regard, and I did not find it clearly in the code.
The meaning in the literature is to calculate the force of the fluid on the solid particles through the momentum equation of the fluid, and the solid particles follow Newton's second law to move. I think my problem is mainly in the first step, how to calculate the force of the fluid particles on the solid particles through the momentum equation of the fluid?
My understanding：There are several variables in the momentum equation, such as pressure, density, and pressure can be obtained from density through the equation of state. The key is the density here, the density of particles(such as particle a) is calculated by interpolation of all particles in its(in otherwords, a's) support domain, then can I understand it as , the floating body is discretized into particles, and like fluid particles, it participates in the calculation of the continuity equation in order to update the density of all particles, and then we can get the dv/dt for fluid particles, Multiply the resulting value by the fluid particle mass and sum all fluid particles( which formed the nearest circle of fluid particles to the floating body), then we can get the force of fluid particles applied to the float-body, then sum other force and update according to Newton's second law.
Is my above understanding correct?
Is there a more detailed introduction to this step?
I think the coupling here should not be the same as the one in the figure below (A fluid particle interacts with a particle point on the nearest solid particle. Picture is from：https://doi.org/10.1016/j.powtec.2021.04.044).
https://forums.dual.sphysics.org/uploads/095/RSC9Z0FMDM7L.png
who can give me some help？@Alex @Asalih3d @Ricardo Can you give me some help? Thanks very much!
Thanks for any reply !