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In this paper we have discussed the modified gravity and scalar field DEmodel specifically DBI essence model with the analysis of thermodynamics duringcosmological evolution. We have used the modified gravity with the formf(R,T)=R+2\Lambda T in our calculations. The basic aim behind this paper is todiscuss a theory that unifies modified gravity with DE models including thesolutions of some cosmological problems like thermodynamics energy conditionsviolation problems, finite time future singularity problems, initialsingularity problem, Cosmic inflation problem, decelerated expansion problem,graceful exit problem, reheating problem, bouncing nature problem, phasetransformation-spontaneous symmetry breaking problem, negative heat capacityparadox problem and obviously the present day universe problems (Continuouslydecreasing temperature problem, present day DE dominated expansion problem). Wehave established the viscous effects (both positive and negative viscosity) inour calculation and discussed the negative-positive viscosity by introducingtwo special type of energy cycles. Finally, we have discussed the stabilityconditions for universe evolution through cosmic perturbation and resolved theinstability problems. We have also shown the state finder trajectories for bothwith and without viscous fluid on the basis of our calculations to compare ourresearch with the results of other independent DE models

Multiple fluid theory of cosmic evolution and its thermodynamic analysis