"DensityDTvalue"

cadff1 · December 2021

Dear developer,

Good afternoon.

Please, this is not clear for me:

What term of the right side of the Equation below receives the value 0.1 (DensityDTvalue), presented below?

The Equation is in the literature:

Domínguez, J.M., Fourtakas, G., Altomare, C. et al. DualSPHysics: from fluid dynamics to multiphysics problems. Comp. Part. Mech. (2021). https://doi.org/10.1007/s40571-021-00404-2

Thanks so much.

Best regards.

Asalih3d · December 2021

That would be the "delta" in that equation. "h" is the smoothing length, "c" speed of sound of particle a, in DualSPHysics basically a constant. The rest are the terms.

Kind regards

cadff1 · December 2021

Dear colleague,

Thanks for your response.

I also had this suspicion.

It is a dimensionless constant.

Regards.

Alex · December 2021

Page 136 of XML_GUIDE_v5.0.pd in DualSPHysics_v5.0\doc\guides

cadff1 · December 2021

Thanks, Alex.

Lucy · February 2022

hi you all,

I note that the defult value of DensityDTvalue is 0.1. Can i change it to another value, such as 0.01? Does it affect the simulation result stongly?

Kind regards,

Lucy

Alex · February 2022

The value is based on details studies conducted by the developers of the so-called delta-SPH formulation.

You can find more information here:

Antuono M, Colagrossi A, Marrone S, Molteni D. 2010. Free-surface flows solved by means of sph schemes with numerical diffusive terms. Computer Physics Communications, 181 (3), 532-549.

Antuono M, Colagrossi A, Marrone S. 2012. Numerical diffusive terms in weakly-compressible SPH schemes. Computer Physics Communications, 183 (12), 2570-2580.

cadff1 · April 2022

Thanks, Alex.

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"DensityDTvalue"

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