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Speed up calculation time DEM

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Old   October 2, 2018, 04:17
Question Speed up calculation time DEM
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Hey everyone!

I'm trying to simulate particles with a size of 3*10^-5 diameter and a youngh's modulus of 2 Gpa. They flow through a tube filled with liquid. The amount of particles I try to simulate are around 20,000. The velocity magnitude is not that high, around 0.3 m/s. The time step I use for the rest of the calculations is 10^-3s.

All this combined makes my calculations really slow because of the substepping. Will increasing the substepping time influence my calculations much?

I thought the program takes a really small substepping time because of the rayleigh wave speed. However, my particles don't interact much with eachother, only sometimes with the wall. Which would mean increasing the substepping time manually does not influence my calculations much?

I hope I gave enough information, if I did not feel free to ask.

kind regards,
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Old   October 14, 2022, 14:58
Default Any solutions?
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Hello I know its years later, but has anyone found any solutions or tips to increase the DEM simulation speed (other than decreasing the Young's modulus)?
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Old   November 16, 2022, 08:20
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The interactons are important, for example play whit normal spring stiffness if it is too small the particle go trow the wall like a phantom and change the sub step times.... use the more simple model and then try to change for other.

or try to use hertz mindlin and the only variable important is the young moduls ....

the "mesh" of the geometry is important more triangles more interactions more time... in meshless too
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calculation time, dem

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