Particle injection at fluid velocity

kuprat · October 22, 2019, 16:15

I'm injecting particles into a geometry using MPPICFoam (OpenFOAM-7) and the standard tutorial injection velocity is zero:
constant/kinematicCloudProperties:

subModels
{
injectionModels
{
inletInjection
{
type patchInjection;

U0 (0 0 0);
etc.

However, I want to inject particles at the continuum fluid velocity (U.air). When I replace the relevant line above with
U0 U.air;
it gives an error because it is looking for a '(' character. Is there some way of injecting at fluid velocity U.air?
Andrew

balloon · January 20, 2023, 18:32

Is there a solution to this question? Thanks

alainislas · January 21, 2023, 11:16

Dear balloon,

Please note that the particle injection velocity should be specified in vector format, i.e., (# # #). If you want the particles to have the same initial velocity as the carrier, just input the same value as the one defined in 0/U.air.

October 22, 2019, 16:15	Particle injection at fluid velocity	#1
kuprat New Member Andrew Kuprat Join Date: Jan 2016 Posts: 3 Rep Power: 10	I'm injecting particles into a geometry using MPPICFoam (OpenFOAM-7) and the standard tutorial injection velocity is zero: constant/kinematicCloudProperties: subModels { injectionModels { inletInjection { type patchInjection; U0 (0 0 0); etc. However, I want to inject particles at the continuum fluid velocity (U.air). When I replace the relevant line above with U0 U.air; it gives an error because it is looking for a '(' character. Is there some way of injecting at fluid velocity U.air? Andrew Last edited by kuprat; October 22, 2019 at 18:48. Reason: correction

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January 20, 2023, 18:32		#2
balloon New Member Join Date: Oct 2020 Posts: 6 Rep Power: 6	Is there a solution to this question? Thanks

January 21, 2023, 11:16		#3
alainislas Senior Member Alain Islas Join Date: Nov 2019 Location: Mexico Posts: 142 Rep Power: 7	Dear balloon, Please note that the particle injection velocity should be specified in vector format, i.e., (# # #). If you want the particles to have the same initial velocity as the carrier, just input the same value as the one defined in 0/U.air.