Computational Exploration of Collective Motion of Active Fluids Presentation
Ahmed Al Rawahi
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04/04/2021
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Computational Exploration of Collective Motion of Active Fluids research focus in the active nematic particles. The main purpose of the my presentation is to show how the use of MATLAB to visualize systems are helpful for the main purpose of the research.
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- [00:00:00.480]Hello everyone. I'm [inaudible], I'm senior in mechanical engineering.
- [00:00:05.670]And today I'm going to talk about my final project presentation in UCare.
- [00:00:10.530]I worked under professor [inaudible] in the topic,
- [00:00:14.580]computational exploration of collective motion of active fluid.
- [00:00:19.320]And this is in the department of mechanical and material engineering in the
- [00:00:24.090]university of Nebraska-Lincoln let's get started with a brief
- [00:00:28.410]introduction about active matters.
- [00:00:32.010]Active methods are used to describe a large collection of particles that excerpt
- [00:00:36.150]energy from the surrounding in order to convert it to mechanical energy,
- [00:00:40.950]which in most cases are result in striking spatial temporal
- [00:00:45.420]collective motion.
- [00:00:47.010]There are three main forces are responsible for active matter movement,
- [00:00:51.510]which are internal deriving pores generated by the conception of energy,
- [00:00:56.670]which called self-propelling and then forces due to interaction with
- [00:01:01.470]each other particle and then, uh, environment and noise.
- [00:01:06.390]And this is quoted from purpose or pediatric or river.
- [00:01:09.990]So more system will go to an equilibrium state,
- [00:01:12.900]unlike active methods that the [inaudible] to individual
- [00:01:17.490]energy disputing active matter origins for most cases are
- [00:01:22.290]from biological. And it can vary insights.
- [00:01:25.770]Example from size small size to a bigger size will be Lectio area
- [00:01:30.690]solar met, or school of fish and flocks of birds.
- [00:01:34.800]And here are figures one show,
- [00:01:36.540]some example of those and the flux
- [00:01:41.370]of flux of where the school of fish and sea will be a large
- [00:01:46.170]amount of human since they have the ability to convert chemical energy inside
- [00:01:50.640]the work body into mechanical energy and the is a big deal. Yeah,
- [00:01:55.980]so the research would focus on a specific type of active monitor called active
- [00:02:00.750]in the metrics activity metrics have our road light shape of our micro scale
- [00:02:05.370]particles, which has the ability of self propulsion and active.
- [00:02:09.750]And pneumatics is a,
- [00:02:11.160]is the active version of crystals used in liquid crystal display
- [00:02:15.810]NCD, which are commonly used nowadays.
- [00:02:19.980]What did from [inaudible] the ability to control
- [00:02:24.960]and there itself,
- [00:02:25.890]I simply have active pneumatics can lead to design and synthesis of
- [00:02:30.600]materials and systems that they want straight energy Convergint and
- [00:02:35.280]soil capability found in nature active. They might,
- [00:02:39.000]this can be the foundation material for adaptive meta material
- [00:02:43.860]with dynamical behavior.
- [00:02:46.770]Going through the motivation of this here, uh, is,
- [00:02:50.390]is to be able to design such meter devices, X habit think desirable,
- [00:02:55.350]split spatial temporal pattern that are for
- [00:02:59.920]extracting chemical energy at was length scale micro meter
- [00:03:04.720]and converted into useful mechanical work at larger scale meters
- [00:03:10.540]and active animatics can also be programmed to generate fluid flows that
- [00:03:15.490]drive assembly of other particle and polymers.
- [00:03:18.880]And this will be useful in a bio bio medical uses,
- [00:03:23.590]for example,
- [00:03:24.430]a deliver a direct delivery system in order to deliver the drug to certain to
- [00:03:29.350]certain areas, uh, will be used by, excuse me,
- [00:03:34.210]will be used by, uh, active animatics.
- [00:03:38.050]So figure three here, just, uh, show, uh,
- [00:03:41.140]what we already explained about, uh, active matter that, uh,
- [00:03:45.990]unlike a passive particle does not have a Librium state.
- [00:03:50.470]So in the top picture,
- [00:03:52.060]which is about the passive and system or classical fluid,
- [00:03:56.410]we know that after, uh, after mixing the fluids,
- [00:04:00.040]after some time, it will go to ACLU equilibrium.
- [00:04:04.180]We are Kibby dynasty,
- [00:04:06.460]which is showing on the volume of the H picture, just 30%,
- [00:04:10.600]the thermal energy, wherever in the barn picture,
- [00:04:14.410]the active matter after a long time will not go to an equilibrium, uh,
- [00:04:19.300]due to the self per pool or for appealing, uh,
- [00:04:23.350]of each particle. And there will be interaction with each particle.
- [00:04:27.350]So there is no equilibrium. However,
- [00:04:30.250]it will go to a steady state to going through the method to control and
- [00:04:35.230]the active assembly of, uh, active animatics. It is important to the active,
- [00:04:40.200]and it might take system as flexible or flowing in a background fluid
- [00:04:45.250]to do this. MATLAB will be used to weather.
- [00:04:47.910]Those systems as a little art flow will be used for the analyzes.
- [00:04:52.330]The equation for the streamlining of the cylinder flow is given by the
- [00:04:55.990]following. We are, you will notice the maximum velocity of the fluid.
- [00:05:00.520]And then L is the wave length of the exchange.
- [00:05:07.450]And then from fluid mechanics,
- [00:05:09.130]we can derive the velocity field in the X and Y direction.
- [00:05:13.570]And also we can derive the orientation of the particle and the orientation
- [00:05:18.520]of the particle will represent how, how the particle,
- [00:05:21.980]the sorority I think about itself or its center alpha is, uh,
- [00:05:26.980]about, uh, alpha is equal to the particle act, Accenture certainty,
- [00:05:31.690]which are present how the particles are shaped.
- [00:05:34.510]So for a alpha equal to zero
- [00:05:38.710]or alpha equal to zero, the particle will be as Sephora Oracle,
- [00:05:42.970]where emphas alpha equal to one.
- [00:05:45.760]It's what we will be used to for our study,
- [00:05:49.000]which will be a road like where vs has just the swimming
- [00:05:53.680]parameter.
- [00:05:55.450]And just to mention the swimming of meter here is just to represent the self
- [00:06:00.200]port. However,
- [00:06:01.880]the self-propelling will be something like an engine that will move only for
- [00:06:06.410]work and the particle acts.
- [00:06:08.760]So it's going to move to the right to the left or to the back.
- [00:06:12.740]The only force that will represent the swimming barometer is just on
- [00:06:17.720]the, on the forward direction,
- [00:06:21.320]going through the result and death. And the goal is to,
- [00:06:24.560]to investigate the effect of V S and alpha in the cellular flow. Uh,
- [00:06:29.060]we will be using the independent flow,
- [00:06:31.970]which means X not will be equal to zero in the steam line
- [00:06:36.410]equation, which is X amount of T. And then we will,
- [00:06:40.280][inaudible] the equation by introducing the guard stimulant and timescale,
- [00:06:45.650]which are L and L of our unit and the swimming parameter
- [00:06:50.480]V S equal to VP of our unit.
- [00:06:53.510]And we will use our own diminishing condition on this space and also,
- [00:06:58.400]or not on this space, on the, on the region that we will be analyzing.
- [00:07:02.570]And then the figures will be in a steady state,
- [00:07:05.930]which mean of Tagalog time. And MATLAB, of course will be used.
- [00:07:10.370]And here is just then a picture of how the fluid is moving.
- [00:07:14.450]So we have kind of four sales. So if,
- [00:07:18.590]if any particles are moving inside one sales,
- [00:07:21.950]then most likely it will be a therapy inside that sales,
- [00:07:24.920]where if a party can move between sales,
- [00:07:27.620]this will be for most cases, it's,
- [00:07:30.410]we'll just be moving around the sales, not entering the sale.
- [00:07:35.450]So after the investigation,
- [00:07:37.550]we show the relation between alpha and a V S so the top two
- [00:07:42.320]pictures also dimension that the blue particles are a blue
- [00:07:46.970]particles, which move between boundaries and North particles, which are corrupt.
- [00:07:51.800]So the top two pictures or figures show the relation
- [00:07:56.540]when alpha is constant while increasing vs
- [00:08:01.340]excuse me. So increasing vs will result in particles,
- [00:08:06.170]the more particles escape the sale.
- [00:08:10.100]While if we look at the left, two pictures above each other,
- [00:08:14.600]we see the relation as we fixing V S so as we
- [00:08:19.310]decrease, uh, alpha, as we decrease alpha, more,
- [00:08:24.350]more, uh, sales will be trapped inside.
- [00:08:28.790]So in conclusion,
- [00:08:29.900]there is a goal is to investigate and analyze the behavior of active
- [00:08:34.400]pneumatics in order to develop designs and syntheses of material and
- [00:08:38.930]systems that demonstrate energy Convergint and strong capability found in
- [00:08:43.760]nature. Excuse me.
- [00:08:46.970]So far we studied and analyze the effect of self perpetuating.
- [00:08:50.990]We S four road like shape particles, which are called pneumatics,
- [00:08:55.890]and that's mean alpha equal to one or close to one,
- [00:09:02.040]Excuse me, isn't necessarily that are in a alpha,
- [00:09:05.460]alpha equal to one NSL at our flow.
- [00:09:08.970]So as we S more particle can secure escape from sales
- [00:09:13.740]while decreasing alpha mean may make particles trapped
- [00:09:18.300]inside the sale and the future of this research, uh,
- [00:09:22.650]there are search we'll explore active pneumatics in more depth and investigate
- [00:09:27.240]time dependence flow of the vibe of the five bars and the ability
- [00:09:32.160]of five bucks to form coherent, spatial,
- [00:09:35.130]temporal stark jar with, and without noise. Thank you.
- [00:09:39.480]Thank you for listening and have it Gary Day carries. Is there a difference?
- [00:09:44.990]Okay.
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