Research Article Zero and Nonzero Mass Flux Effects of Bioconvective Viscoelastic Nanofluid over a 3D Riga Surface with the Swimming of Gyrotactic Microorganisms T. S. Karthik, 1 K. Loganathan , 2 A. N. Shankar, 3 M. Jemimah Carmichael, 4 Anand Mohan, 5 Mohammed K. A. Kaabar , 6 and Safak Kayikci 7 1 Department of Electronics and Communication Engineering, Aditya College of Engineering and Technology, Surampalem, 533 437 Andhra Pradesh, India 2 Research and Development Wing, Live4Research, Tiruppur, 638 106 Tamilnadu, India 3 Department of HSE Civil Engineering, University of Petroleum Energy Studies, Uttarakhand, India 4 Department of Civil Engineering, Vignan’s Lara Institute of Technology and Science, Guntur, Andhra Pradesh, India 5 Department of Physics, LN Mithila University, Darbhanga, Bihar, India 6 Jabalia Camp, UNWRA Palestinian Refugee Camp, Gaza Strip Jabalya, State of Palestine 7 Department of Computer Engineering, Bolu Abant Izzet Baysal University, Bolu, Turkey Correspondence should be addressed to K. Loganathan; loganathankaruppusamy304@gmail.com and Mohammed K. A. Kaabar; mohammed.kaabar@wsu.edu Received 25 March 2021; Revised 15 May 2021; Accepted 11 June 2021; Published 16 July 2021 Academic Editor: Mustafa Inc Copyright © 2021 T. S. Karthik et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. This work addresses 3D bioconvective viscoelastic nanofluid flow across a heated Riga surface with nonlinear radiation, swimming microorganisms, and nanoparticles. The nanoparticles are tested with zero (passive) and nonzero (active) mass flux states along with the effect of thermophoresis and Brownian motion. The physical system is visualized via high linearity PDE systems and nondimensionalized to high linearity ordinary differential systems. The converted ordinary differential systems are solved with the aid of the homotopy analytic method (HAM). Several valuable and appropriate characteristics of related profiles are presented graphically and discussed in detail. Results of interest such as the modified Hartmann number, mixed convection parameter, bioconvection Rayleigh number, and Brownian motion parameter are discussed in terms of various profiles. The numerical coding is validated with earlier reports, and excellent agreement is observed. The microorganisms are utilized to improve the thermal conductivity of nanofluid, and this mechanism has more utilization in the oil refinery process. 1. Introduction “Bioconvection” is known to be the convective movement within sight of swimming microorganisms. In this convec- tive mode, the cells with bottom-heavy cells tend to swim at an angle to vertical, and this process is known as gyro- tactic [1]. Therefore, the gyrotactic microorganisms are stable in the upper layer of the fluid, and consequently, stratification of the top-heavy fluid layer will become unbalanced. Thus, the system, which consists of a gyrotac- tic microorganism, induces one of the exciting characters in heat transfer that is “stability.” The reason is that nano- fluids that have higher stability tend to improve the ther- mal efficiency of the heat exchanger (any energy systems). Hosseinzadeh et al. [2] examined the gyrotactic microorganism influence over a cylindrical surface with cross fluid flow. Mogharrebi et al. [3] present the MHD nanofluid flow towards a rotating cone with motile oxytac- tic microorganisms. Nowadays, the research on nanofluid through a Riga plate becomes an exciting area of research. For instance, mixed convective nanofluid flowed a Riga plate is studied numerically and analytically in [4]. It is shown that the desired size of the nanoparticle influences the skin friction coefficient. Ahmad et al. [5] studied the Hindawi Advances in Mathematical Physics Volume 2021, Article ID 9914134, 13 pages https://doi.org/10.1155/2021/9914134